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190381 = 613121
BaseRepresentation
bin101110011110101101
3100200011011
4232132231
522043011
64025221
71422022
oct563655
9320134
10190381
11120044
1292211
1368869
144d549
153b621

190381 has 4 divisors (see below), whose sum is σ = 193564. Its totient is φ = 187200.

The previous prime is 190369. The next prime is 190387. The reversal of 190381 is 183091.

It can be divided in two parts, 190 and 381, that multiplied together give a triangular number (72390 = T380).

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2025 + 188356 = 45^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 190381 - 211 = 188333 is a prime.

It is a super-2 number, since 2×1903812 = 72489850322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (48391).

2190381 is an apocalyptic number.

It is an amenable number.

190381 is a deficient number, since it is larger than the sum of its proper divisors (3183).

190381 is an equidigital number, since it uses as much as digits as its factorization.

190381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 190381 is about 436.3267124530. The cubic root of 190381 is about 57.5273719711.

The spelling of 190381 in words is "one hundred ninety thousand, three hundred eighty-one".

Divisors: 1 61 3121 190381