400040404000 has 96 divisors (see below), whose sum is σ = 993943969200. Its totient is φ = 158218086400.

The previous prime is 400040403877. The next prime is 400040404021. The reversal of 400040404000 is 404040004.

It can be written as a sum of positive squares in 8 ways, for example, as 22223653776 + 377816750224 = 149076^2 + 614668^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 205855 + ... + 917854.

Almost surely, 2^400040404000 is an apocalyptic number.

400040404000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400040404000 is an abundant number, since it is smaller than the sum of its proper divisors (593903565200).

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

400040404000 is a wasteful number, since it uses less digits than its factorization.

400040404000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123823 (or 1123805 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 400040404000 its reverse (404040004), we get a palindrome (400444444004).

The spelling of 400040404000 in words is "four hundred billion, forty million, four hundred four thousand".