39917980 has 24 divisors (see below), whose sum is σ = 84601440. Its totient is φ = 15819840.

The previous prime is 39917971. The next prime is 39917981. The reversal of 39917980 is 8971993.

It is a self number, because there is not a number n which added to its sum of digits gives 39917980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39917981) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6976 + ... + 11335.

It is an arithmetic number, because the mean of its divisors is an integer number (3525060).

Almost surely, 2^39917980 is an apocalyptic number.

It is an amenable number.

39917980 is an abundant number, since it is smaller than the sum of its proper divisors (44683460).

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

39917980 is a wasteful number, since it uses less digits than its factorization.

39917980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18429 (or 18427 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 39917980 is about 6318.0677425935. The cubic root of 39917980 is about 341.7612756705.

The spelling of 39917980 in words is "thirty-nine million, nine hundred seventeen thousand, nine hundred eighty".