39969978 has 24 divisors (see below), whose sum is σ = 80998368. Its totient is φ = 13149192.

The previous prime is 39969967. The next prime is 39969991. The reversal of 39969978 is 87996993.

39969978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11 ways as a sum of consecutive naturals, for example, 40851 + ... + 41817.

It is an arithmetic number, because the mean of its divisors is an integer number (3374932).

Almost surely, 2^39969978 is an apocalyptic number.

39969978 is an abundant number, since it is smaller than the sum of its proper divisors (41028390).

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

39969978 is an equidigital number, since it uses as much as digits as its factorization.

39969978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1055 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 60.

The square root of 39969978 is about 6322.1814273240. The cubic root of 39969978 is about 341.9096064239.

The spelling of 39969978 in words is "thirty-nine million, nine hundred sixty-nine thousand, nine hundred seventy-eight".