39724072 has 8 divisors (see below), whose sum is σ = 74482650. Its totient is φ = 19862032.

The previous prime is 39724067. The next prime is 39724093. The reversal of 39724072 is 27042793.

It can be written as a sum of positive squares in only one way, i.e., 22033636 + 17690436 = 4694^2 + 4206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×39724072² = 3156003792522368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2482747 + ... + 2482762.

Almost surely, 2^39724072 is an apocalyptic number.

It is an amenable number.

39724072 is a deficient number, since it is larger than the sum of its proper divisors (34758578).

39724072 is a wasteful number, since it uses less digits than its factorization.

39724072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4965515 (or 4965511 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 39724072 is about 6302.7035468916. The cubic root of 39724072 is about 341.2069904245.

The spelling of 39724072 in words is "thirty-nine million, seven hundred twenty-four thousand, seventy-two".