400031120 has 20 divisors (see below), whose sum is σ = 930072540. Its totient is φ = 160012416.

The previous prime is 400031119. The next prime is 400031141. The reversal of 400031120 is 21130004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 171295744 + 228735376 = 13088^2 + 15124^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500115 + ... + 2500274.

It is an arithmetic number, because the mean of its divisors is an integer number (46503627).

Almost surely, 2^400031120 is an apocalyptic number.

400031120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400031120 is an abundant number, since it is smaller than the sum of its proper divisors (530041420).

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

400031120 is a wasteful number, since it uses less digits than its factorization.

400031120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000402 (or 5000396 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 400031120 is about 20000.7779848685. Note that the first 3 decimals coincide. The cubic root of 400031120 is about 736.8254070759.

Adding to 400031120 its reverse (21130004), we get a palindrome (421161124).

The spelling of 400031120 in words is "four hundred million, thirty-one thousand, one hundred twenty".