400404220 has 24 divisors (see below), whose sum is σ = 841814064. Its totient is φ = 159977856.

The previous prime is 400404181. The next prime is 400404227. The reversal of 400404220 is 22404004.

It is a junction number, because it is equal to n+sod(n) for n = 400404194 and 400404203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400404227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7104 + ... + 29176.

It is an arithmetic number, because the mean of its divisors is an integer number (35075586).

Almost surely, 2^400404220 is an apocalyptic number.

It is an amenable number.

400404220 is an abundant number, since it is smaller than the sum of its proper divisors (441409844).

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

400404220 is a wasteful number, since it uses less digits than its factorization.

400404220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22989 (or 22987 counting only the distinct ones).

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

The square root of 400404220 is about 20010.1029482609. The cubic root of 400404220 is about 737.0544093732.

Adding to 400404220 its reverse (22404004), we get a palindrome (422808224).

It can be divided in two parts, 4004042 and 20, that multiplied together give a triangular number (80080840 = T₁₂₆₅₅).

The spelling of 400404220 in words is "four hundred million, four hundred four thousand, two hundred twenty".