38171920 has 20 divisors (see below), whose sum is σ = 88749900. Its totient is φ = 15268736.

The previous prime is 38171911. The next prime is 38171971. The reversal of 38171920 is 2917183.

It can be written as a sum of positive squares in 2 ways, for example, as 6091024 + 32080896 = 2468^2 + 5664^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238495 + ... + 238654.

It is an arithmetic number, because the mean of its divisors is an integer number (4437495).

Almost surely, 2^38171920 is an apocalyptic number.

It is an amenable number.

38171920 is an abundant number, since it is smaller than the sum of its proper divisors (50577980).

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

38171920 is a wasteful number, since it uses less digits than its factorization.

38171920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477162 (or 477156 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 38171920 is about 6178.3428198830. The cubic root of 38171920 is about 336.7037874742.

The spelling of 38171920 in words is "thirty-eight million, one hundred seventy-one thousand, nine hundred twenty".