256858142 has 8 divisors (see below), whose sum is σ = 385736256. Its totient is φ = 128279392.

The previous prime is 256858139. The next prime is 256858163. The reversal of 256858142 is 241858652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×256858142² = 131952210223384328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256858142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72683 + ... + 76134.

It is an arithmetic number, because the mean of its divisors is an integer number (48217032).

Almost surely, 2^256858142 is an apocalyptic number.

256858142 is a deficient number, since it is larger than the sum of its proper divisors (128878114).

256858142 is a wasteful number, since it uses less digits than its factorization.

256858142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149682.

The product of its digits is 153600, while the sum is 41.

The square root of 256858142 is about 16026.7945017087. The cubic root of 256858142 is about 635.6691167455.

The spelling of 256858142 in words is "two hundred fifty-six million, eight hundred fifty-eight thousand, one hundred forty-two".