39978794 has 8 divisors (see below), whose sum is σ = 60350628. Its totient is φ = 19861920.

The previous prime is 39978779. The next prime is 39978821. The reversal of 39978794 is 49787993.

It can be written as a sum of positive squares in 2 ways, for example, as 38626225 + 1352569 = 6215^2 + 1163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63347 + ... + 63974.

Almost surely, 2^39978794 is an apocalyptic number.

39978794 is a deficient number, since it is larger than the sum of its proper divisors (20371834).

39978794 is a wasteful number, since it uses less digits than its factorization.

39978794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127480.

The product of its digits is 3429216, while the sum is 56.

The square root of 39978794 is about 6322.8786165796. The cubic root of 39978794 is about 341.9347424022.

The spelling of 39978794 in words is "thirty-nine million, nine hundred seventy-eight thousand, seven hundred ninety-four".