6989621 has 4 divisors (see below), whose sum is σ = 7010112. Its totient is φ = 6969132.

The previous prime is 6989617. The next prime is 6989627. The reversal of 6989621 is 1269896.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6989621 - 2² = 6989617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6989627) 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, 9725 + ... + 10418.

It is an arithmetic number, because the mean of its divisors is an integer number (1752528).

Almost surely, 2^6989621 is an apocalyptic number.

It is an amenable number.

6989621 is a deficient number, since it is larger than the sum of its proper divisors (20491).

6989621 is a wasteful number, since it uses less digits than its factorization.

6989621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20490.

The product of its digits is 46656, while the sum is 41.

The square root of 6989621 is about 2643.7891368262. The cubic root of 6989621 is about 191.1985271649.

The spelling of 6989621 in words is "six million, nine hundred eighty-nine thousand, six hundred twenty-one".