6990637 has 4 divisors (see below), whose sum is σ = 6996700. Its totient is φ = 6984576.

The previous prime is 6990629. The next prime is 6990667. The reversal of 6990637 is 7360996.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 695556 + 6295081 = 834^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 6990637 - 2³ = 6990629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6990637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990617) 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 3 ways as a sum of consecutive naturals, for example, 708 + ... + 3805.

It is an arithmetic number, because the mean of its divisors is an integer number (1749175).

Almost surely, 2^6990637 is an apocalyptic number.

It is an amenable number.

6990637 is a deficient number, since it is larger than the sum of its proper divisors (6063).

6990637 is a wasteful number, since it uses less digits than its factorization.

6990637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6062.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 6990637 is about 2643.9812782998. The cubic root of 6990637 is about 191.2077908189.

The spelling of 6990637 in words is "six million, nine hundred ninety thousand, six hundred thirty-seven".