39668631 has 4 divisors (see below), whose sum is σ = 52891512. Its totient is φ = 26445752.

The previous prime is 39668597. The next prime is 39668653. The reversal of 39668631 is 13686693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39668631 - 2⁶ = 39668567 is a prime.

It is a super-2 number, since 2×39668631² = 3147200570828322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39668131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6611436 + ... + 6611441.

It is an arithmetic number, because the mean of its divisors is an integer number (13222878).

Almost surely, 2^39668631 is an apocalyptic number.

39668631 is a deficient number, since it is larger than the sum of its proper divisors (13222881).

39668631 is a wasteful number, since it uses less digits than its factorization.

39668631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13222880.

The product of its digits is 139968, while the sum is 42.

The square root of 39668631 is about 6298.3038192834. The cubic root of 39668631 is about 341.0481810588.

The spelling of 39668631 in words is "thirty-nine million, six hundred sixty-eight thousand, six hundred thirty-one".