256400418 has 16 divisors (see below), whose sum is σ = 517879296. Its totient is φ = 84620400.

The previous prime is 256400407. The next prime is 256400447. The reversal of 256400418 is 814004652.

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, 210946 + ... + 212157.

It is an arithmetic number, because the mean of its divisors is an integer number (32367456).

Almost surely, 2^256400418 is an apocalyptic number.

256400418 is an abundant number, since it is smaller than the sum of its proper divisors (261478878).

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

256400418 is a wasteful number, since it uses less digits than its factorization.

256400418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423209.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 256400418 is about 16012.5081733000. The cubic root of 256400418 is about 635.2913024758.

The spelling of 256400418 in words is "two hundred fifty-six million, four hundred thousand, four hundred eighteen".