6657139 has 4 divisors (see below), whose sum is σ = 6667024. Its totient is φ = 6647256.

The previous prime is 6657109. The next prime is 6657179. The reversal of 6657139 is 9317566.

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 6657139 - 2⁵ = 6657107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6657098 and 6657107.

It is not an unprimeable number, because it can be changed into a prime (6657109) 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, 3852 + ... + 5305.

It is an arithmetic number, because the mean of its divisors is an integer number (1666756).

Almost surely, 2^6657139 is an apocalyptic number.

6657139 is a deficient number, since it is larger than the sum of its proper divisors (9885).

6657139 is an equidigital number, since it uses as much as digits as its factorization.

6657139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9884.

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

The square root of 6657139 is about 2580.1432130795. The cubic root of 6657139 is about 188.1175042543.

The spelling of 6657139 in words is "six million, six hundred fifty-seven thousand, one hundred thirty-nine".