6658939 has 4 divisors (see below), whose sum is σ = 7610224. Its totient is φ = 5707656.

The previous prime is 6658921. The next prime is 6658961. The reversal of 6658939 is 9398566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9398566 = 2 ⋅4699283.

It is a cyclic number.

It is not a de Polignac number, because 6658939 - 2⁹ = 6658427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6658909) 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, 475632 + ... + 475645.

It is an arithmetic number, because the mean of its divisors is an integer number (1902556).

Almost surely, 2^6658939 is an apocalyptic number.

6658939 is a deficient number, since it is larger than the sum of its proper divisors (951285).

6658939 is an equidigital number, since it uses as much as digits as its factorization.

6658939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951284.

The product of its digits is 349920, while the sum is 46.

The square root of 6658939 is about 2580.4920073505. The cubic root of 6658939 is about 188.1344575327.

It can be divided in two parts, 665 and 8939, that added together give a square (9604 = 98²).

The spelling of 6658939 in words is "six million, six hundred fifty-eight thousand, nine hundred thirty-nine".