400220400 has 60 divisors (see below), whose sum is σ = 1282043192. Its totient is φ = 106725120.

The previous prime is 400220371. The next prime is 400220411. The reversal of 400220400 is 4022004.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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, 165559 + ... + 167958.

Almost surely, 2^400220400 is an apocalyptic number.

400220400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400220400 is an abundant number, since it is smaller than the sum of its proper divisors (881822792).

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

400220400 is a wasteful number, since it uses less digits than its factorization.

400220400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333538 (or 333527 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400220400 is about 20005.5092412065. The cubic root of 400220400 is about 736.9416016377.

Adding to 400220400 its reverse (4022004), we get a palindrome (404242404).

The spelling of 400220400 in words is "four hundred million, two hundred twenty thousand, four hundred".