406256644 has 24 divisors (see below), whose sum is σ = 722796480. Its totient is φ = 199754016.

The previous prime is 406256639. The next prime is 406256671. The reversal of 406256644 is 446652604.

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, 236862 + ... + 238570.

It is an arithmetic number, because the mean of its divisors is an integer number (30116520).

Almost surely, 2^406256644 is an apocalyptic number.

It is an amenable number.

406256644 is a deficient number, since it is larger than the sum of its proper divisors (316539836).

406256644 is a wasteful number, since it uses less digits than its factorization.

406256644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667 (or 2665 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 406256644 is about 20155.8091874278. The cubic root of 406256644 is about 740.6280545822.

It can be divided in two parts, 4062 and 56644, that added together give a palindrome (60706).

The spelling of 406256644 in words is "four hundred six million, two hundred fifty-six thousand, six hundred forty-four".