400440404040 has 64 divisors (see below), whose sum is σ = 1206306034560. Its totient is φ = 106341012480.

The previous prime is 400440403973. The next prime is 400440404053. The reversal of 400440404040 is 40404044004.

It is a Harshad number since it is a multiple of its sum of digits (24).

400440404040 is a modest number, since divided by 404040 gives 400440 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 400440404040.

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, 6894324 + ... + 6952163.

It is an arithmetic number, because the mean of its divisors is an integer number (18848531790).

Almost surely, 2^400440404040 is an apocalyptic number.

400440404040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400440404040 is an abundant number, since it is smaller than the sum of its proper divisors (805865630520).

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

400440404040 is a wasteful number, since it uses less digits than its factorization.

400440404040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13846742 (or 13846738 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 400440404040 its reverse (40404044004), we get a palindrome (440844448044).

The spelling of 400440404040 in words is "four hundred billion, four hundred forty million, four hundred four thousand, forty".