39689644 has 12 divisors (see below), whose sum is σ = 69512968. Its totient is φ = 19828800.

The previous prime is 39689597. The next prime is 39689647. The reversal of 39689644 is 44698693.

It is not an unprimeable number, because it can be changed into a prime (39689647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2884 + ... + 9364.

Almost surely, 2^39689644 is an apocalyptic number.

It is an amenable number.

39689644 is a deficient number, since it is larger than the sum of its proper divisors (29823324).

39689644 is a wasteful number, since it uses less digits than its factorization.

39689644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016 (or 8014 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 39689644 is about 6299.9717459684. The cubic root of 39689644 is about 341.1083896773.

Subtracting from 39689644 its sum of digits (49), we obtain a triangular number (39689595 = T₈₉₀₉).

The spelling of 39689644 in words is "thirty-nine million, six hundred eighty-nine thousand, six hundred forty-four".