16890321 has 16 divisors (see below), whose sum is σ = 25878528. Its totient is φ = 9598800.

The previous prime is 16890317. The next prime is 16890323. The reversal of 16890321 is 12309861.

It is not a de Polignac number, because 16890321 - 2² = 16890317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16890323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1906 + ... + 6116.

It is an arithmetic number, because the mean of its divisors is an integer number (1617408).

Almost surely, 2^16890321 is an apocalyptic number.

It is an amenable number.

16890321 is a deficient number, since it is larger than the sum of its proper divisors (8988207).

16890321 is a wasteful number, since it uses less digits than its factorization.

16890321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4412.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 16890321 is about 4109.7835709439. The cubic root of 16890321 is about 256.5739938291.

The spelling of 16890321 in words is "sixteen million, eight hundred ninety thousand, three hundred twenty-one".