400672040 has 16 divisors (see below), whose sum is σ = 901512180. Its totient is φ = 160268800.

The previous prime is 400672021. The next prime is 400672043. The reversal of 400672040 is 40276004.

It can be written as a sum of positive squares in 2 ways, for example, as 397842916 + 2829124 = 19946^2 + 1682^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400671997 and 400672015.

It is not an unprimeable number, because it can be changed into a prime (400672043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5008361 + ... + 5008440.

Almost surely, 2^400672040 is an apocalyptic number.

400672040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400672040 is an abundant number, since it is smaller than the sum of its proper divisors (500840140).

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

400672040 is a wasteful number, since it uses less digits than its factorization.

400672040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10016812 (or 10016808 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 400672040 is about 20016.7939490819. The cubic root of 400672040 is about 737.2187049416.

The spelling of 400672040 in words is "four hundred million, six hundred seventy-two thousand, forty".