16989555 has 16 divisors (see below), whose sum is σ = 29654784. Its totient is φ = 8237280.

The previous prime is 16989547. The next prime is 16989569. The reversal of 16989555 is 55598961.

It is a happy number.

It is not a de Polignac number, because 16989555 - 2³ = 16989547 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 51319 + ... + 51648.

It is an arithmetic number, because the mean of its divisors is an integer number (1853424).

Almost surely, 2^16989555 is an apocalyptic number.

16989555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16989555 is a deficient number, since it is larger than the sum of its proper divisors (12665229).

16989555 is a wasteful number, since it uses less digits than its factorization.

16989555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102986.

The product of its digits is 486000, while the sum is 48.

The square root of 16989555 is about 4121.8387886961. The cubic root of 16989555 is about 257.0754874217.

The spelling of 16989555 in words is "sixteen million, nine hundred eighty-nine thousand, five hundred fifty-five".