16812989 has 4 divisors (see below), whose sum is σ = 16836480. Its totient is φ = 16789500.

The previous prime is 16812979. The next prime is 16812997. The reversal of 16812989 is 98921861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16812989 is a prime.

It is a super-2 number, since 2×16812989² = 565353198228242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16812959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10637 + ... + 12114.

It is an arithmetic number, because the mean of its divisors is an integer number (4209120).

Almost surely, 2^16812989 is an apocalyptic number.

It is an amenable number.

16812989 is a deficient number, since it is larger than the sum of its proper divisors (23491).

16812989 is an equidigital number, since it uses as much as digits as its factorization.

16812989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23490.

The product of its digits is 62208, while the sum is 44.

The square root of 16812989 is about 4100.3644959930. The cubic root of 16812989 is about 256.1818217192.

The spelling of 16812989 in words is "sixteen million, eight hundred twelve thousand, nine hundred eighty-nine".