39964656 has 20 divisors (see below), whose sum is σ = 103242152. Its totient is φ = 13321536.

The previous prime is 39964643. The next prime is 39964747. The reversal of 39964656 is 65646993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 832597 = 39964656 / (3 + 9 + 9 + 6 + 4 + 6 + 5 + 6).

It is a congruent 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, 416251 + ... + 416346.

Almost surely, 2^39964656 is an apocalyptic number.

It is an amenable number.

39964656 is an abundant number, since it is smaller than the sum of its proper divisors (63277496).

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

39964656 is a wasteful number, since it uses less digits than its factorization.

39964656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832608 (or 832602 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 48.

The square root of 39964656 is about 6321.7605142871. The cubic root of 39964656 is about 341.8944306696.

The spelling of 39964656 in words is "thirty-nine million, nine hundred sixty-four thousand, six hundred fifty-six".