39913569 has 12 divisors (see below), whose sum is σ = 61044516. Its totient is φ = 25043712.

The previous prime is 39913567. The next prime is 39913583. The reversal of 39913569 is 96531993.

It can be written as a sum of positive squares in 2 ways, for example, as 35247969 + 4665600 = 5937^2 + 2160^2 .

It is not a de Polignac number, because 39913569 - 2¹ = 39913567 is a prime.

It is a super-2 number, since 2×39913569² = 3186185980635522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39913561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130284 + ... + 130589.

It is an arithmetic number, because the mean of its divisors is an integer number (5087043).

Almost surely, 2^39913569 is an apocalyptic number.

It is an amenable number.

39913569 is a deficient number, since it is larger than the sum of its proper divisors (21130947).

39913569 is a wasteful number, since it uses less digits than its factorization.

39913569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260896 (or 260893 counting only the distinct ones).

The product of its digits is 196830, while the sum is 45.

The square root of 39913569 is about 6317.7186547044. The cubic root of 39913569 is about 341.7486868194.

The spelling of 39913569 in words is "thirty-nine million, nine hundred thirteen thousand, five hundred sixty-nine".