16959621 has 16 divisors (see below), whose sum is σ = 26394624. Its totient is φ = 9484464.

The previous prime is 16959599. The next prime is 16959667. The reversal of 16959621 is 12695961.

It is not a de Polignac number, because 16959621 - 2⁵ = 16959589 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16959621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16959121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7605 + ... + 9578.

It is an arithmetic number, because the mean of its divisors is an integer number (1649664).

Almost surely, 2^16959621 is an apocalyptic number.

It is an amenable number.

16959621 is a deficient number, since it is larger than the sum of its proper divisors (9435003).

16959621 is a wasteful number, since it uses less digits than its factorization.

16959621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17240.

The product of its digits is 29160, while the sum is 39.

The square root of 16959621 is about 4118.2060414700. The cubic root of 16959621 is about 256.9244177098.

The spelling of 16959621 in words is "sixteen million, nine hundred fifty-nine thousand, six hundred twenty-one".