39780018 has 32 divisors (see below), whose sum is σ = 92246400. Its totient is φ = 12683088.

The previous prime is 39780011. The next prime is 39780019. The reversal of 39780018 is 81008793.

It is not an unprimeable number, because it can be changed into a prime (39780011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14773 + ... + 17256.

It is an arithmetic number, because the mean of its divisors is an integer number (2882700).

Almost surely, 2^39780018 is an apocalyptic number.

39780018 is an abundant number, since it is smaller than the sum of its proper divisors (52466382).

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

39780018 is a wasteful number, since it uses less digits than its factorization.

39780018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32063 (or 32057 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 39780018 is about 6307.1402394429. The cubic root of 39780018 is about 341.3670966341.

The spelling of 39780018 in words is "thirty-nine million, seven hundred eighty thousand, eighteen".