16189890 has 16 divisors (see below), whose sum is σ = 38855808. Its totient is φ = 4317296.

The previous prime is 16189889. The next prime is 16189903. The reversal of 16189890 is 9898161.

16189890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16189890² = 524225076424200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269802 + ... + 269861.

It is an arithmetic number, because the mean of its divisors is an integer number (2428488).

Almost surely, 2^16189890 is an apocalyptic number.

16189890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16189890 is an abundant number, since it is smaller than the sum of its proper divisors (22665918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16189890 is a wasteful number, since it uses less digits than its factorization.

16189890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539673.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 16189890 is about 4023.6662386436. Note that the first 3 decimals coincide. The cubic root of 16189890 is about 252.9771521911.

The spelling of 16189890 in words is "sixteen million, one hundred eighty-nine thousand, eight hundred ninety".