39997628 has 12 divisors (see below), whose sum is σ = 76359192. Its totient is φ = 18180720.

The previous prime is 39997597. The next prime is 39997631. The reversal of 39997628 is 82679993.

It is a self number, because there is not a number n which added to its sum of digits gives 39997628.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454475 + ... + 454562.

It is an arithmetic number, because the mean of its divisors is an integer number (6363266).

Almost surely, 2^39997628 is an apocalyptic number.

It is an amenable number.

39997628 is a deficient number, since it is larger than the sum of its proper divisors (36361564).

39997628 is a wasteful number, since it uses less digits than its factorization.

39997628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909052 (or 909050 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 53.

The square root of 39997628 is about 6324.3677944914. The cubic root of 39997628 is about 341.9884290968.

It can be divided in two parts, 399976 and 28, that added together give a palindrome (400004).

The spelling of 39997628 in words is "thirty-nine million, nine hundred ninety-seven thousand, six hundred twenty-eight".