405723928 has 16 divisors (see below), whose sum is σ = 776918880. Its totient is φ = 198545568.

The previous prime is 405723917. The next prime is 405723931. The reversal of 405723928 is 829327504.

It is a super-2 number, since 2×405723928² = 329223811503498368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539151 + ... + 539902.

It is an arithmetic number, because the mean of its divisors is an integer number (48557430).

Almost surely, 2^405723928 is an apocalyptic number.

It is an amenable number.

405723928 is a deficient number, since it is larger than the sum of its proper divisors (371194952).

405723928 is a wasteful number, since it uses less digits than its factorization.

405723928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079106 (or 1079102 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 405723928 is about 20142.5899029891. The cubic root of 405723928 is about 740.3041895255.

The spelling of 405723928 in words is "four hundred five million, seven hundred twenty-three thousand, nine hundred twenty-eight".