39979880 has 32 divisors (see below), whose sum is σ = 90180000. Its totient is φ = 15951936.

The previous prime is 39979871. The next prime is 39979889. The reversal of 39979880 is 8897993.

It is an interprime number because it is at equal distance from previous prime (39979871) and next prime (39979889).

It is not an unprimeable number, because it can be changed into a prime (39979889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18959 + ... + 20961.

It is an arithmetic number, because the mean of its divisors is an integer number (2818125).

Almost surely, 2^39979880 is an apocalyptic number.

It is an amenable number.

39979880 is an abundant number, since it is smaller than the sum of its proper divisors (50200120).

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

39979880 is a wasteful number, since it uses less digits than its factorization.

39979880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513 (or 2509 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 39979880 is about 6322.9644946022. The cubic root of 39979880 is about 341.9378385250.

The spelling of 39979880 in words is "thirty-nine million, nine hundred seventy-nine thousand, eight hundred eighty".