400403800 has 24 divisors (see below), whose sum is σ = 930939300. Its totient is φ = 160161440.

The previous prime is 400403797. The next prime is 400403807. The reversal of 400403800 is 8304004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400403807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000810 + ... + 1001209.

Almost surely, 2^400403800 is an apocalyptic number.

400403800 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400403800 is an abundant number, since it is smaller than the sum of its proper divisors (530535500).

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

400403800 is a wasteful number, since it uses less digits than its factorization.

400403800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002035 (or 2002026 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 400403800 is about 20010.0924535595. The cubic root of 400403800 is about 737.0541516645.

Adding to 400403800 its reverse (8304004), we get a palindrome (408707804).

The spelling of 400403800 in words is "four hundred million, four hundred three thousand, eight hundred".