6639369 has 8 divisors (see below), whose sum is σ = 9657312. Its totient is φ = 4023840.

The previous prime is 6639349. The next prime is 6639377. The reversal of 6639369 is 9639366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6639369 - 2⁵ = 6639337 is a prime.

It is a super-2 number, since 2×6639369² = 88162441436322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6639369.

It is not an unprimeable number, because it can be changed into a prime (6639349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100564 + ... + 100629.

It is an arithmetic number, because the mean of its divisors is an integer number (1207164).

Almost surely, 2^6639369 is an apocalyptic number.

It is an amenable number.

6639369 is a deficient number, since it is larger than the sum of its proper divisors (3017943).

6639369 is a wasteful number, since it uses less digits than its factorization.

6639369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201207.

The product of its digits is 157464, while the sum is 42.

The square root of 6639369 is about 2576.6973046906. The cubic root of 6639369 is about 187.9499734856.

It can be divided in two parts, 6639 and 369, that multiplied together give a triangular number (2449791 = T₂₂₁₃).

The spelling of 6639369 in words is "six million, six hundred thirty-nine thousand, three hundred sixty-nine".