8139739 has 4 divisors (see below), whose sum is σ = 8154424. Its totient is φ = 8125056.

The previous prime is 8139709. The next prime is 8139743. The reversal of 8139739 is 9379318.

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 8139739 - 2⁵ = 8139707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8139709) 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, 6477 + ... + 7630.

It is an arithmetic number, because the mean of its divisors is an integer number (2038606).

Almost surely, 2^8139739 is an apocalyptic number.

8139739 is a deficient number, since it is larger than the sum of its proper divisors (14685).

8139739 is a wasteful number, since it uses less digits than its factorization.

8139739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14684.

The product of its digits is 40824, while the sum is 40.

The square root of 8139739 is about 2853.0227829444. The cubic root of 8139739 is about 201.1577765017.

The spelling of 8139739 in words is "eight million, one hundred thirty-nine thousand, seven hundred thirty-nine".