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194481 = 3474
BaseRepresentation
bin101111011110110001
3100212210000
4233132301
522210411
64100213
71440000
oct573661
9325700
10194481
11123131
1294669
136a6a1
1450c37
153c956
hex2f7b1

194481 has 25 divisors (see below), whose sum is σ = 338921. Its totient is φ = 111132.

The previous prime is 194479. The next prime is 194483. The reversal of 194481 is 184491.

194481 = T440 + T441.

The square root of 194481 is 441.

It is a perfect power (a square, a biquadrate), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (194479) and next prime (194483).

It is not a de Polignac number, because 194481 - 21 = 194479 is a prime.

It is a super-2 number, since 2×1944812 = 75645718722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 194481.

It is not an unprimeable number, because it can be changed into a prime (194483) by changing a digit.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 27780 + ... + 27786.

194481 is a Friedman number, since it can be written as (9-4+8*(1+1))^4, using all its digits and the basic arithmetic operations.

2194481 is an apocalyptic number.

194481 is the 441-st square number.

194481 is the 221-st centered octagonal number.

It is an amenable number.

194481 is a deficient number, since it is larger than the sum of its proper divisors (144440).

194481 is an frugal number, since it uses more digits than its factorization.

194481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40 (or 10 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The cubic root of 194481 is about 57.9374077040.

It can be divided in two parts, 1944 and 81, that multiplied together give a cube (157464 = 543).

The spelling of 194481 in words is "one hundred ninety-four thousand, four hundred eighty-one".

Divisors: 1 3 7 9 21 27 49 63 81 147 189 343 441 567 1029 1323 2401 3087 3969 7203 9261 21609 27783 64827 194481