39138920 has 16 divisors (see below), whose sum is σ = 88062660. Its totient is φ = 15655552.

The previous prime is 39138919. The next prime is 39138937. The reversal of 39138920 is 2983193.

It can be written as a sum of positive squares in 2 ways, for example, as 38019556 + 1119364 = 6166^2 + 1058^2 .

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, 489197 + ... + 489276.

Almost surely, 2^39138920 is an apocalyptic number.

It is an amenable number.

39138920 is an abundant number, since it is smaller than the sum of its proper divisors (48923740).

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

39138920 is a wasteful number, since it uses less digits than its factorization.

39138920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978484 (or 978480 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 39138920 is about 6256.1106128329. The cubic root of 39138920 is about 339.5233227876.

The spelling of 39138920 in words is "thirty-nine million, one hundred thirty-eight thousand, nine hundred twenty".