16890605 has 12 divisors (see below), whose sum is σ = 21532980. Its totient is φ = 12716544.

The previous prime is 16890581. The next prime is 16890607. The reversal of 16890605 is 50609861.

It can be written as a sum of positive squares in 6 ways, for example, as 4932841 + 11957764 = 2221^2 + 3458^2 .

It is not a de Polignac number, because 16890605 - 2⁶ = 16890541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16890607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4400 + ... + 7289.

It is an arithmetic number, because the mean of its divisors is an integer number (1794415).

Almost surely, 2^16890605 is an apocalyptic number.

It is an amenable number.

16890605 is a deficient number, since it is larger than the sum of its proper divisors (4642375).

16890605 is a wasteful number, since it uses less digits than its factorization.

16890605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11728 (or 11711 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 16890605 is about 4109.8181224964. The cubic root of 16890605 is about 256.5754318639.

The spelling of 16890605 in words is "sixteen million, eight hundred ninety thousand, six hundred five".