400765090 has 32 divisors (see below), whose sum is σ = 787988736. Its totient is φ = 145541760.

The previous prime is 400765067. The next prime is 400765091. The reversal of 400765090 is 90567004.

It is a super-2 number, since 2×400765090² = 321225314725416200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400765091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102919 + ... + 106741.

It is an arithmetic number, because the mean of its divisors is an integer number (24624648).

Almost surely, 2^400765090 is an apocalyptic number.

400765090 is a deficient number, since it is larger than the sum of its proper divisors (387223646).

400765090 is a wasteful number, since it uses less digits than its factorization.

400765090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 400765090 is about 20019.1181124444. The cubic root of 400765090 is about 737.2757698093.

The spelling of 400765090 in words is "four hundred million, seven hundred sixty-five thousand, ninety".