39947218 has 8 divisors (see below), whose sum is σ = 60183180. Its totient is φ = 19886160.

The previous prime is 39947207. The next prime is 39947221. The reversal of 39947218 is 81274993.

It can be written as a sum of positive squares in 2 ways, for example, as 27008809 + 12938409 = 5197^2 + 3597^2 .

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

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, 43153 + ... + 44068.

Almost surely, 2^39947218 is an apocalyptic number.

39947218 is a deficient number, since it is larger than the sum of its proper divisors (20235962).

39947218 is a wasteful number, since it uses less digits than its factorization.

39947218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87452.

The product of its digits is 108864, while the sum is 43.

The square root of 39947218 is about 6320.3811593922. The cubic root of 39947218 is about 341.8446965376.

The spelling of 39947218 in words is "thirty-nine million, nine hundred forty-seven thousand, two hundred eighteen".