6996639 has 32 divisors (see below), whose sum is σ = 10874304. Its totient is φ = 3962880.

The previous prime is 6996631. The next prime is 6996643. The reversal of 6996639 is 9366996.

It is not a de Polignac number, because 6996639 - 2³ = 6996631 is a prime.

6996639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6996631) 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 31 ways as a sum of consecutive naturals, for example, 40357 + ... + 40529.

It is an arithmetic number, because the mean of its divisors is an integer number (339822).

Almost surely, 2^6996639 is an apocalyptic number.

6996639 is a deficient number, since it is larger than the sum of its proper divisors (3877665).

6996639 is a wasteful number, since it uses less digits than its factorization.

6996639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267.

The product of its digits is 472392, while the sum is 48.

The square root of 6996639 is about 2645.1160655064. The cubic root of 6996639 is about 191.2624973678.

The spelling of 6996639 in words is "six million, nine hundred ninety-six thousand, six hundred thirty-nine".