39825009 has 48 divisors (see below), whose sum is σ = 68658304. Its totient is φ = 21772800.

The previous prime is 39824989. The next prime is 39825017. The reversal of 39825009 is 90052893.

It is not a de Polignac number, because 39825009 - 2⁹ = 39824497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39825089) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165129 + ... + 165369.

Almost surely, 2^39825009 is an apocalyptic number.

It is an amenable number.

39825009 is a deficient number, since it is larger than the sum of its proper divisors (28833295).

39825009 is a wasteful number, since it uses less digits than its factorization.

39825009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 39825009 is about 6310.7059034628. The cubic root of 39825009 is about 341.4957429691.

The spelling of 39825009 in words is "thirty-nine million, eight hundred twenty-five thousand, nine".