39720556 has 6 divisors (see below), whose sum is σ = 69510980. Its totient is φ = 19860276.

The previous prime is 39720553. The next prime is 39720557. The reversal of 39720556 is 65502793.

39720556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (39720553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4965066 + ... + 4965073.

Almost surely, 2^39720556 is an apocalyptic number.

It is an amenable number.

39720556 is a deficient number, since it is larger than the sum of its proper divisors (29790424).

39720556 is a wasteful number, since it uses less digits than its factorization.

39720556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9930143 (or 9930141 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 39720556 is about 6302.4246127978. The cubic root of 39720556 is about 341.1969233198.

The spelling of 39720556 in words is "thirty-nine million, seven hundred twenty thousand, five hundred fifty-six".