39666216 has 32 divisors (see below), whose sum is σ = 100425600. Its totient is φ = 13054080.

The previous prime is 39666203. The next prime is 39666217. The reversal of 39666216 is 61266693.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (39666217) 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, 8565 + ... + 12356.

It is an arithmetic number, because the mean of its divisors is an integer number (3138300).

Almost surely, 2^39666216 is an apocalyptic number.

It is an amenable number.

39666216 is an abundant number, since it is smaller than the sum of its proper divisors (60759384).

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

39666216 is a wasteful number, since it uses less digits than its factorization.

39666216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21009 (or 21005 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 39666216 is about 6298.1120980815. The cubic root of 39666216 is about 341.0412599891.

The spelling of 39666216 in words is "thirty-nine million, six hundred sixty-six thousand, two hundred sixteen".