400938161508 has 36 divisors (see below), whose sum is σ = 1015015891708. Its totient is φ = 133443858240.

The previous prime is 400938161473. The next prime is 400938161521. The reversal of 400938161508 is 805161839004.

400938161508 is a `hidden beast` number, since 4 + 0 + 0 + 9 + 3 + 81 + 61 + 508 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 356717118564 + 44221042944 = 597258^2 + 210288^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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, 8400691 + ... + 8448282.

Almost surely, 2^400938161508 is an apocalyptic number.

It is an amenable number.

400938161508 is an abundant number, since it is smaller than the sum of its proper divisors (614077730200).

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

400938161508 is a wasteful number, since it uses less digits than its factorization.

400938161508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16849644 (or 16849639 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 400938161508 in words is "four hundred billion, nine hundred thirty-eight million, one hundred sixty-one thousand, five hundred eight".