39729940 has 12 divisors (see below), whose sum is σ = 83432916. Its totient is φ = 15891968.

The previous prime is 39729929. The next prime is 39729959. The reversal of 39729940 is 4992793.

39729940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19766916 + 19963024 = 4446^2 + 4468^2 .

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 993229 + ... + 993268.

It is an arithmetic number, because the mean of its divisors is an integer number (6952743).

Almost surely, 2^39729940 is an apocalyptic number.

It is an amenable number.

39729940 is an abundant number, since it is smaller than the sum of its proper divisors (43702976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39729940 is a wasteful number, since it uses less digits than its factorization.

39729940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986506 (or 1986504 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 39729940 is about 6303.1690442189. The cubic root of 39729940 is about 341.2237905152.

The spelling of 39729940 in words is "thirty-nine million, seven hundred twenty-nine thousand, nine hundred forty".