16890388 has 6 divisors (see below), whose sum is σ = 29558186. Its totient is φ = 8445192.

The previous prime is 16890371. The next prime is 16890397. The reversal of 16890388 is 88309861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16744464 + 145924 = 4092^2 + 382^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2111295 + ... + 2111302.

Almost surely, 2^16890388 is an apocalyptic number.

It is an amenable number.

16890388 is a deficient number, since it is larger than the sum of its proper divisors (12667798).

16890388 is a wasteful number, since it uses less digits than its factorization.

16890388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222601 (or 4222599 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 16890388 is about 4109.7917222166. The cubic root of 16890388 is about 256.5743330853.

The spelling of 16890388 in words is "sixteen million, eight hundred ninety thousand, three hundred eighty-eight".