6621989 has 8 divisors (see below), whose sum is σ = 7312032. Its totient is φ = 5946640.

The previous prime is 6621961. The next prime is 6621991. The reversal of 6621989 is 9891266.

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

It is a cyclic number.

It is not a de Polignac number, because 6621989 - 2¹² = 6617893 is a prime.

It is a super-2 number, since 2×6621989² = 87701476632242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2714 + ... + 4539.

It is an arithmetic number, because the mean of its divisors is an integer number (914004).

Almost surely, 2^6621989 is an apocalyptic number.

It is an amenable number.

6621989 is a deficient number, since it is larger than the sum of its proper divisors (690043).

6621989 is a wasteful number, since it uses less digits than its factorization.

6621989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347.

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

The square root of 6621989 is about 2573.3225604265. The cubic root of 6621989 is about 187.7858301254.

The spelling of 6621989 in words is "six million, six hundred twenty-one thousand, nine hundred eighty-nine".