256398192 has 60 divisors (see below), whose sum is σ = 727418224. Its totient is φ = 84291840.

The previous prime is 256398187. The next prime is 256398203. The reversal of 256398192 is 291893652.

256398192 is a `hidden beast` number, since 2 + 5 + 639 + 8 + 1 + 9 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1684 + ... + 22707.

Almost surely, 2^256398192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256398192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363709112).

256398192 is an abundant number, since it is smaller than the sum of its proper divisors (471020032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256398192 is a wasteful number, since it uses less digits than its factorization.

256398192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24478 (or 24469 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 256398192 is about 16012.4386649879. The cubic root of 256398192 is about 635.2894639940.

The spelling of 256398192 in words is "two hundred fifty-six million, three hundred ninety-eight thousand, one hundred ninety-two".