400445540 has 48 divisors (see below), whose sum is σ = 971357184. Its totient is φ = 137049600.

The previous prime is 400445509. The next prime is 400445597. The reversal of 400445540 is 45544004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49796 + ... + 57275.

It is an arithmetic number, because the mean of its divisors is an integer number (20236608).

Almost surely, 2^400445540 is an apocalyptic number.

It is an amenable number.

400445540 is an abundant number, since it is smaller than the sum of its proper divisors (570911644).

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

400445540 is a wasteful number, since it uses less digits than its factorization.

400445540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107108 (or 107106 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 400445540 is about 20011.1354000716. The cubic root of 400445540 is about 737.0797621202.

Adding to 400445540 its reverse (45544004), we get a palindrome (445989544).

The spelling of 400445540 in words is "four hundred million, four hundred forty-five thousand, five hundred forty".