405790644 has 24 divisors (see below), whose sum is σ = 1082108608. Its totient is φ = 115940160.

The previous prime is 405790639. The next prime is 405790661. The reversal of 405790644 is 446097504.

It is a happy number.

It is a congruent number.

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, 2415337 + ... + 2415504.

Almost surely, 2^405790644 is an apocalyptic number.

It is an amenable number.

405790644 is an abundant number, since it is smaller than the sum of its proper divisors (676317964).

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

405790644 is a wasteful number, since it uses less digits than its factorization.

405790644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830855 (or 4830853 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 405790644 is about 20144.2459278078. The cubic root of 405790644 is about 740.3447650860.

The spelling of 405790644 in words is "four hundred five million, seven hundred ninety thousand, six hundred forty-four".