400505156 has 12 divisors (see below), whose sum is σ = 710485692. Its totient is φ = 197509248.

The previous prime is 400505111. The next prime is 400505201. The reversal of 400505156 is 651505004.

It is an interprime number because it is at equal distance from previous prime (400505111) and next prime (400505201).

It can be written as a sum of positive squares in 2 ways, for example, as 248377600 + 152127556 = 15760^2 + 12334^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685505 + ... + 686088.

It is an arithmetic number, because the mean of its divisors is an integer number (59207141).

Almost surely, 2^400505156 is an apocalyptic number.

It is an amenable number.

400505156 is a deficient number, since it is larger than the sum of its proper divisors (309980536).

400505156 is a wasteful number, since it uses less digits than its factorization.

400505156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371670 (or 1371668 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 400505156 is about 20012.6249152878. The cubic root of 400505156 is about 737.1163376860.

The spelling of 400505156 in words is "four hundred million, five hundred five thousand, one hundred fifty-six".