39904489 has 3 divisors (see below), whose sum is σ = 39910807. Its totient is φ = 39898172.

The previous prime is 39904477. The next prime is 39904511. The reversal of 39904489 is 98440993.

The square root of 39904489 is 6317.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 18421264 = 4635^2 + 4292^2 .

It is not a de Polignac number, because 39904489 - 2¹¹ = 39902441 is a prime.

It is a super-2 number, since 2×39904489² = 3184736484702242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39904429) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3159 + ... + 9475.

Almost surely, 2^39904489 is an apocalyptic number.

39904489 is the 6317-th square number.

39904489 is the 3159-th centered octagonal number.

It is an amenable number.

39904489 is a deficient number, since it is larger than the sum of its proper divisors (6318).

39904489 is an frugal number, since it uses more digits than its factorization.

39904489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12634 (or 6317 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The cubic root of 39904489 is about 341.7227698736.

The spelling of 39904489 in words is "thirty-nine million, nine hundred four thousand, four hundred eighty-nine".