7656139 has 4 divisors (see below), whose sum is σ = 7669480. Its totient is φ = 7642800.

The previous prime is 7656133. The next prime is 7656149. The reversal of 7656139 is 9316567.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9316567 = 13 ⋅716659.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7656139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7656098 and 7656107.

It is not an unprimeable number, because it can be changed into a prime (7656133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5769 + ... + 6970.

It is an arithmetic number, because the mean of its divisors is an integer number (1917370).

Almost surely, 2^7656139 is an apocalyptic number.

7656139 is a deficient number, since it is larger than the sum of its proper divisors (13341).

7656139 is a wasteful number, since it uses less digits than its factorization.

7656139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340.

The product of its digits is 34020, while the sum is 37.

The square root of 7656139 is about 2766.9728946992. The cubic root of 7656139 is about 197.0924265891.

The spelling of 7656139 in words is "seven million, six hundred fifty-six thousand, one hundred thirty-nine".