39680691 has 4 divisors (see below), whose sum is σ = 52907592. Its totient is φ = 26453792.

The previous prime is 39680689. The next prime is 39680699. The reversal of 39680691 is 19608693.

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 39680691 - 2¹ = 39680689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39680699) 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, 6613446 + ... + 6613451.

It is an arithmetic number, because the mean of its divisors is an integer number (13226898).

Almost surely, 2^39680691 is an apocalyptic number.

39680691 is a deficient number, since it is larger than the sum of its proper divisors (13226901).

39680691 is a wasteful number, since it uses less digits than its factorization.

39680691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13226900.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 39680691 is about 6299.2611471505. The cubic root of 39680691 is about 341.0827392156.

The spelling of 39680691 in words is "thirty-nine million, six hundred eighty thousand, six hundred ninety-one".