39991930 has 16 divisors (see below), whose sum is σ = 78529824. Its totient is φ = 14542480.

The previous prime is 39991927. The next prime is 39991937. The reversal of 39991930 is 3919993.

39991930 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 (39991937) 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 in 7 ways as a sum of consecutive naturals, for example, 181672 + ... + 181891.

It is an arithmetic number, because the mean of its divisors is an integer number (4908114).

Almost surely, 2^39991930 is an apocalyptic number.

39991930 is a deficient number, since it is larger than the sum of its proper divisors (38537894).

39991930 is a wasteful number, since it uses less digits than its factorization.

39991930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363581.

The product of its (nonzero) digits is 59049, while the sum is 43.

The square root of 39991930 is about 6323.9172986370. The cubic root of 39991930 is about 341.9721886120.

It can be divided in two parts, 3999 and 1930, that added together give a square (5929 = 77²).

The spelling of 39991930 in words is "thirty-nine million, nine hundred ninety-one thousand, nine hundred thirty".