39121913 has 18 divisors (see below), whose sum is σ = 43636698. Its totient is φ = 34951680.

The previous prime is 39121909. The next prime is 39121933. The reversal of 39121913 is 31912193.

It can be written as a sum of positive squares in 9 ways, for example, as 4700224 + 34421689 = 2168^2 + 5867^2 .

It is not a de Polignac number, because 39121913 - 2² = 39121909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39121933) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 954173 + ... + 954213.

It is an arithmetic number, because the mean of its divisors is an integer number (2424261).

Almost surely, 2^39121913 is an apocalyptic number.

It is an amenable number.

39121913 is a deficient number, since it is larger than the sum of its proper divisors (4514785).

39121913 is an equidigital number, since it uses as much as digits as its factorization.

39121913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 95 counting only the distinct ones).

The product of its digits is 1458, while the sum is 29.

The square root of 39121913 is about 6254.7512340620. The cubic root of 39121913 is about 339.4741380739.

The spelling of 39121913 in words is "thirty-nine million, one hundred twenty-one thousand, nine hundred thirteen".