39640724 has 6 divisors (see below), whose sum is σ = 69371274. Its totient is φ = 19820360.

The previous prime is 39640721. The next prime is 39640729. The reversal of 39640724 is 42704693.

It can be written as a sum of positive squares in only one way, i.e., 35188624 + 4452100 = 5932^2 + 2110^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39640721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4955087 + ... + 4955094.

It is an arithmetic number, because the mean of its divisors is an integer number (11561879).

Almost surely, 2^39640724 is an apocalyptic number.

It is an amenable number.

39640724 is a deficient number, since it is larger than the sum of its proper divisors (29730550).

39640724 is a wasteful number, since it uses less digits than its factorization.

39640724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9910185 (or 9910183 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 39640724 is about 6296.0879917612. The cubic root of 39640724 is about 340.9681861601.

The spelling of 39640724 in words is "thirty-nine million, six hundred forty thousand, seven hundred twenty-four".