400499872 has 48 divisors (see below), whose sum is σ = 836923752. Its totient is φ = 188006400.

The previous prime is 400499857. The next prime is 400499873. The reversal of 400499872 is 278994004.

It can be written as a sum of positive squares in 4 ways, for example, as 123743376 + 276756496 = 11124^2 + 16636^2 .

It is not an unprimeable number, because it can be changed into a prime (400499873) 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, 332872 + ... + 334072.

Almost surely, 2^400499872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400499872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418461876).

400499872 is an abundant number, since it is smaller than the sum of its proper divisors (436423880).

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

400499872 is a wasteful number, since it uses less digits than its factorization.

400499872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 400499872 is about 20012.4928981874. The cubic root of 400499872 is about 737.1130959967.

The spelling of 400499872 in words is "four hundred million, four hundred ninety-nine thousand, eight hundred seventy-two".