400400040400 has 60 divisors (see below), whose sum is σ = 963486206944. Its totient is φ = 159906096000.

The previous prime is 400400040389. The next prime is 400400040413. The reversal of 400400040400 is 4040004004.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540786 + ... + 1045585.

Almost surely, 2^400400040400 is an apocalyptic number.

400400040400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400400040400 is an abundant number, since it is smaller than the sum of its proper divisors (563086166544).

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

400400040400 is a wasteful number, since it uses less digits than its factorization.

400400040400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587020 (or 1587009 counting only the distinct ones).

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

Adding to 400400040400 its reverse (4040004004), we get a palindrome (404440044404).

The spelling of 400400040400 in words is "four hundred billion, four hundred million, forty thousand, four hundred".