400428690 has 16 divisors (see below), whose sum is σ = 961028928. Its totient is φ = 106780976.

The previous prime is 400428641. The next prime is 400428697. The reversal of 400428690 is 96824004.

It is a super-2 number, since 2×400428690² = 320686271550232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400428697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6673782 + ... + 6673841.

It is an arithmetic number, because the mean of its divisors is an integer number (60064308).

Almost surely, 2^400428690 is an apocalyptic number.

400428690 is an abundant number, since it is smaller than the sum of its proper divisors (560600238).

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

400428690 is a wasteful number, since it uses less digits than its factorization.

400428690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347633.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 400428690 is about 20010.7143800515. The cubic root of 400428690 is about 737.0694236621.

The spelling of 400428690 in words is "four hundred million, four hundred twenty-eight thousand, six hundred ninety".