256140404 has 24 divisors (see below), whose sum is σ = 483345408. Its totient is φ = 118067040.

The previous prime is 256140373. The next prime is 256140413. The reversal of 256140404 is 404041652.

It is a super-2 number, since 2×256140404² = 131215813122566432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 7 ways as a sum of consecutive naturals, for example, 44669 + ... + 50075.

It is an arithmetic number, because the mean of its divisors is an integer number (20139392).

Almost surely, 2^256140404 is an apocalyptic number.

It is an amenable number.

256140404 is a deficient number, since it is larger than the sum of its proper divisors (227205004).

256140404 is a wasteful number, since it uses less digits than its factorization.

256140404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6335 (or 6333 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 256140404 is about 16004.3870235633. The cubic root of 256140404 is about 635.0764815809.

The spelling of 256140404 in words is "two hundred fifty-six million, one hundred forty thousand, four hundred four".