256408995 has 16 divisors (see below), whose sum is σ = 415199232. Its totient is φ = 135103200.

The previous prime is 256408993. The next prime is 256409033. The reversal of 256408995 is 599804652.

It is not a de Polignac number, because 256408995 - 2¹ = 256408993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256408993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101731 + ... + 104220.

It is an arithmetic number, because the mean of its divisors is an integer number (25949952).

Almost surely, 2^256408995 is an apocalyptic number.

256408995 is a deficient number, since it is larger than the sum of its proper divisors (158790237).

256408995 is a wasteful number, since it uses less digits than its factorization.

256408995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206042.

The product of its (nonzero) digits is 777600, while the sum is 48.

The square root of 256408995 is about 16012.7759929376. The cubic root of 256408995 is about 635.2983862302.

It can be divided in two parts, 256408 and 995, that added together give a triangular number (257403 = T₇₁₇).

The spelling of 256408995 in words is "two hundred fifty-six million, four hundred eight thousand, nine hundred ninety-five".