16306989 has 4 divisors (see below), whose sum is σ = 21742656. Its totient is φ = 10871324.

The previous prime is 16306981. The next prime is 16306993. The reversal of 16306989 is 98960361.

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 not a de Polignac number, because 16306989 - 2³ = 16306981 is a prime.

It is a super-3 number, since 3×16306989³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 16306989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16306981) 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, 2717829 + ... + 2717834.

It is an arithmetic number, because the mean of its divisors is an integer number (5435664).

Almost surely, 2^16306989 is an apocalyptic number.

It is an amenable number.

16306989 is a deficient number, since it is larger than the sum of its proper divisors (5435667).

16306989 is an equidigital number, since it uses as much as digits as its factorization.

16306989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5435666.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 16306989 is about 4038.1913030465. The cubic root of 16306989 is about 253.5856026235.

The spelling of 16306989 in words is "sixteen million, three hundred six thousand, nine hundred eighty-nine".