2656139 has 4 divisors (see below), whose sum is σ = 2747760. Its totient is φ = 2564520.

The previous prime is 2656117. The next prime is 2656141. The reversal of 2656139 is 9316562.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9316562 = 2 ⋅4658281.

It is a cyclic number.

It is not a de Polignac number, because 2656139 - 2¹² = 2652043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656169) 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, 45767 + ... + 45824.

It is an arithmetic number, because the mean of its divisors is an integer number (686940).

2^2656139 is an apocalyptic number.

2656139 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2656139 is a deficient number, since it is larger than the sum of its proper divisors (91621).

2656139 is an equidigital number, since it uses as much as digits as its factorization.

2656139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91620.

The product of its digits is 9720, while the sum is 32.

The square root of 2656139 is about 1629.7665476994. The cubic root of 2656139 is about 138.4895272875.

It can be divided in two parts, 26 and 56139, that added together give a palindrome (56165).

The spelling of 2656139 in words is "two million, six hundred fifty-six thousand, one hundred thirty-nine".