16120989 has 6 divisors (see below), whose sum is σ = 23285886. Its totient is φ = 10747320.

The previous prime is 16120967. The next prime is 16121029. The reversal of 16120989 is 98902161.

It can be written as a sum of positive squares in only one way, i.e., 8749764 + 7371225 = 2958^2 + 2715^2 .

It is not a de Polignac number, because 16120989 - 2⁸ = 16120733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16120939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 895602 + ... + 895619.

It is an arithmetic number, because the mean of its divisors is an integer number (3880981).

Almost surely, 2^16120989 is an apocalyptic number.

It is an amenable number.

16120989 is a deficient number, since it is larger than the sum of its proper divisors (7164897).

16120989 is a wasteful number, since it uses less digits than its factorization.

16120989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791227 (or 1791224 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 16120989 is about 4015.0951420857. The cubic root of 16120989 is about 252.6177681526.

The spelling of 16120989 in words is "sixteen million, one hundred twenty thousand, nine hundred eighty-nine".