39939720 has 64 divisors (see below), whose sum is σ = 120597120. Its totient is φ = 10581504.

The previous prime is 39939719. The next prime is 39939763. The reversal of 39939720 is 2793993.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19044 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (1884330).

Almost surely, 2^39939720 is an apocalyptic number.

39939720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39939720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60298560).

39939720 is an abundant number, since it is smaller than the sum of its proper divisors (80657400).

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

39939720 is a wasteful number, since it uses less digits than its factorization.

39939720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174 (or 2170 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 42.

The square root of 39939720 is about 6319.7879711269. The cubic root of 39939720 is about 341.8233073809.

The spelling of 39939720 in words is "thirty-nine million, nine hundred thirty-nine thousand, seven hundred twenty".