39931906 has 16 divisors (see below), whose sum is σ = 70663680. Its totient is φ = 16561440.

The previous prime is 39931883. The next prime is 39931919. The reversal of 39931906 is 60913993.

It is a plaindrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45571 + ... + 46438.

It is an arithmetic number, because the mean of its divisors is an integer number (4416480).

Almost surely, 2^39931906 is an apocalyptic number.

39931906 is a deficient number, since it is larger than the sum of its proper divisors (30731774).

39931906 is a wasteful number, since it uses less digits than its factorization.

39931906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92049.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 39931906 is about 6319.1697239432. The cubic root of 39931906 is about 341.8010139386.

The spelling of 39931906 in words is "thirty-nine million, nine hundred thirty-one thousand, nine hundred six".