256842115 has 8 divisors (see below), whose sum is σ = 310428720. Its totient is φ = 203994912.

The previous prime is 256842073. The next prime is 256842151. The reversal of 256842115 is 511248652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256842115 - 2⁷ = 256841987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184084 + ... + 185473.

It is an arithmetic number, because the mean of its divisors is an integer number (38803590).

Almost surely, 2^256842115 is an apocalyptic number.

256842115 is a deficient number, since it is larger than the sum of its proper divisors (53586605).

256842115 is a wasteful number, since it uses less digits than its factorization.

256842115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369701.

The product of its digits is 19200, while the sum is 34.

The square root of 256842115 is about 16026.2944874977. The cubic root of 256842115 is about 635.6558953350.

The spelling of 256842115 in words is "two hundred fifty-six million, eight hundred forty-two thousand, one hundred fifteen".