16890081 has 8 divisors (see below), whose sum is σ = 24252480. Its totient is φ = 10393872.

The previous prime is 16890079. The next prime is 16890089. The reversal of 16890081 is 18009861.

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

It is not a de Polignac number, because 16890081 - 2¹ = 16890079 is a prime.

It is a super-2 number, since 2×16890081² = 570549672373122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (16890089) 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, 216501 + ... + 216578.

It is an arithmetic number, because the mean of its divisors is an integer number (3031560).

Almost surely, 2^16890081 is an apocalyptic number.

It is an amenable number.

16890081 is a deficient number, since it is larger than the sum of its proper divisors (7362399).

16890081 is a wasteful number, since it uses less digits than its factorization.

16890081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433095.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 16890081 is about 4109.7543722223. The cubic root of 16890081 is about 256.5727785759.

The spelling of 16890081 in words is "sixteen million, eight hundred ninety thousand, eighty-one".