256440154 has 8 divisors (see below), whose sum is σ = 386340660. Its totient is φ = 127659936.

The previous prime is 256440139. The next prime is 256440187. The reversal of 256440154 is 451044652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 213890625 + 42549529 = 14625^2 + 6523^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279499 + ... + 280414.

Almost surely, 2^256440154 is an apocalyptic number.

256440154 is a deficient number, since it is larger than the sum of its proper divisors (129900506).

256440154 is a wasteful number, since it uses less digits than its factorization.

256440154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560144.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 256440154 is about 16013.7489052376. The cubic root of 256440154 is about 635.3241191556.

The spelling of 256440154 in words is "two hundred fifty-six million, four hundred forty thousand, one hundred fifty-four".