39724749 has 20 divisors (see below), whose sum is σ = 61924896. Its totient is φ = 25330536.

The previous prime is 39724709. The next prime is 39724757. The reversal of 39724749 is 94742793.

It is not a de Polignac number, because 39724749 - 2⁷ = 39724621 is a prime.

It is a super-2 number, since 2×39724749² = 3156111366226002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39724709) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8799 + ... + 12524.

Almost surely, 2^39724749 is an apocalyptic number.

It is an amenable number.

39724749 is a deficient number, since it is larger than the sum of its proper divisors (22200147).

39724749 is a wasteful number, since it uses less digits than its factorization.

39724749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21358 (or 21349 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 39724749 is about 6302.7572537739. The cubic root of 39724749 is about 341.2089287607.

The spelling of 39724749 in words is "thirty-nine million, seven hundred twenty-four thousand, seven hundred forty-nine".