16888889 has 4 divisors (see below), whose sum is σ = 16897140. Its totient is φ = 16880640.

The previous prime is 16888847. The next prime is 16888901. The reversal of 16888889 is 98888861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13630864 + 3258025 = 3692^2 + 1805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16888889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (16888819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1529 + ... + 6009.

It is an arithmetic number, because the mean of its divisors is an integer number (4224285).

Almost surely, 2^16888889 is an apocalyptic number.

It is an amenable number.

16888889 is a deficient number, since it is larger than the sum of its proper divisors (8251).

16888889 is an equidigital number, since it uses as much as digits as its factorization.

16888889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8250.

The product of its digits is 1769472, while the sum is 56.

The square root of 16888889 is about 4109.6093488311. The cubic root of 16888889 is about 256.5667426478.

The spelling of 16888889 in words is "sixteen million, eight hundred eighty-eight thousand, eight hundred eighty-nine".