39978066 has 16 divisors (see below), whose sum is σ = 82713600. Its totient is φ = 12866448.

The previous prime is 39978053. The next prime is 39978073. The reversal of 39978066 is 66087993.

It is a happy number.

It is a super-2 number, since 2×39978066² = 3196491522200712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114706 + ... + 115053.

It is an arithmetic number, because the mean of its divisors is an integer number (5169600).

Almost surely, 2^39978066 is an apocalyptic number.

39978066 is an abundant number, since it is smaller than the sum of its proper divisors (42735534).

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

39978066 is a wasteful number, since it uses less digits than its factorization.

39978066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229793.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 39978066 is about 6322.8210476021. The cubic root of 39978066 is about 341.9326668852.

The spelling of 39978066 in words is "thirty-nine million, nine hundred seventy-eight thousand, sixty-six".