39689725 has 12 divisors (see below), whose sum is σ = 49595040. Its totient is φ = 31506800.

The previous prime is 39689723. The next prime is 39689729. The reversal of 39689725 is 52798693.

It is not a de Polignac number, because 39689725 - 2¹ = 39689723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39689723) 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, 2785 + ... + 9334.

It is an arithmetic number, because the mean of its divisors is an integer number (4132920).

Almost surely, 2^39689725 is an apocalyptic number.

It is an amenable number.

39689725 is a deficient number, since it is larger than the sum of its proper divisors (9905315).

39689725 is a wasteful number, since it uses less digits than its factorization.

39689725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12260 (or 12255 counting only the distinct ones).

The product of its digits is 816480, while the sum is 49.

The square root of 39689725 is about 6299.9781745654. The cubic root of 39689725 is about 341.1086217257.

The spelling of 39689725 in words is "thirty-nine million, six hundred eighty-nine thousand, seven hundred twenty-five".