256291842 has 32 divisors (see below), whose sum is σ = 519782400. Its totient is φ = 84239568.

The previous prime is 256291823. The next prime is 256291873. The reversal of 256291842 is 248192652.

It is a self number, because there is not a number n which added to its sum of digits gives 256291842.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135459 + ... + 137337.

It is an arithmetic number, because the mean of its divisors is an integer number (16243200).

Almost surely, 2^256291842 is an apocalyptic number.

256291842 is an abundant number, since it is smaller than the sum of its proper divisors (263490558).

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

256291842 is a wasteful number, since it uses less digits than its factorization.

256291842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190.

The product of its digits is 69120, while the sum is 39.

The square root of 256291842 is about 16009.1174647449. The cubic root of 256291842 is about 635.2016157692.

The spelling of 256291842 in words is "two hundred fifty-six million, two hundred ninety-one thousand, eight hundred forty-two".