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196921 = 1911031
BaseRepresentation
bin110000000100111001
3101000010101
4300010321
522300141
64115401
71450054
oct600471
9330111
10196921
11124a4a
1295b61
136b82a
1451a9b
153d531
hex30139

196921 has 4 divisors (see below), whose sum is σ = 198144. Its totient is φ = 195700.

The previous prime is 196919. The next prime is 196927. The reversal of 196921 is 129691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129691 = 532447.

It is a cyclic number.

It is not a de Polignac number, because 196921 - 21 = 196919 is a prime.

It is a Duffinian number.

196921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 196921.

It is not an unprimeable number, because it can be changed into a prime (196927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (49536).

2196921 is an apocalyptic number.

It is an amenable number.

196921 is a deficient number, since it is larger than the sum of its proper divisors (1223).

196921 is a wasteful number, since it uses less digits than its factorization.

196921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222.

The product of its digits is 972, while the sum is 28.

The square root of 196921 is about 443.7578168326. The cubic root of 196921 is about 58.1786997470.

The spelling of 196921 in words is "one hundred ninety-six thousand, nine hundred twenty-one".

Divisors: 1 191 1031 196921