16989975 has 18 divisors (see below), whose sum is σ = 30431336. Its totient is φ = 9061200.

The previous prime is 16989967. The next prime is 16989991. The reversal of 16989975 is 57998961.

It is not a de Polignac number, because 16989975 - 2³ = 16989967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 37531 + ... + 37980.

Almost surely, 2^16989975 is an apocalyptic number.

16989975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16989975 is a deficient number, since it is larger than the sum of its proper divisors (13441361).

16989975 is a wasteful number, since it uses less digits than its factorization.

16989975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75527 (or 75519 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 16989975 is about 4121.8897365165. The cubic root of 16989975 is about 257.0776057980.

The spelling of 16989975 in words is "sixteen million, nine hundred eighty-nine thousand, nine hundred seventy-five".