8139691 has 16 divisors (see below), whose sum is σ = 9743040. Its totient is φ = 6652800.

The previous prime is 8139683. The next prime is 8139707. The reversal of 8139691 is 1969318.

8139691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8139691 - 2³ = 8139683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8139691.

It is not an unprimeable number, because it can be changed into a prime (8139611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20305 + ... + 20701.

It is an arithmetic number, because the mean of its divisors is an integer number (608940).

Almost surely, 2^8139691 is an apocalyptic number.

8139691 is a deficient number, since it is larger than the sum of its proper divisors (1603349).

8139691 is a wasteful number, since it uses less digits than its factorization.

8139691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534.

The product of its digits is 11664, while the sum is 37.

The square root of 8139691 is about 2853.0143708015. The cubic root of 8139691 is about 201.1573810921.

The spelling of 8139691 in words is "eight million, one hundred thirty-nine thousand, six hundred ninety-one".