16889821 has 8 divisors (see below), whose sum is σ = 18222624. Its totient is φ = 15561840.

The previous prime is 16889819. The next prime is 16889833. The reversal of 16889821 is 12898861.

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 16889821 - 2¹ = 16889819 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 (16889021) 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, 9966 + ... + 11536.

It is an arithmetic number, because the mean of its divisors is an integer number (2277828).

Almost surely, 2^16889821 is an apocalyptic number.

It is an amenable number.

16889821 is a deficient number, since it is larger than the sum of its proper divisors (1332803).

16889821 is a wasteful number, since it uses less digits than its factorization.

16889821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411.

The product of its digits is 55296, while the sum is 43.

The square root of 16889821 is about 4109.7227400398. The cubic root of 16889821 is about 256.5714620386.

The spelling of 16889821 in words is "sixteen million, eight hundred eighty-nine thousand, eight hundred twenty-one".