16220989 has 4 divisors (see below), whose sum is σ = 16229056. Its totient is φ = 16212924.

The previous prime is 16220977. The next prime is 16221017. The reversal of 16220989 is 98902261.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98902261 = 811 ⋅121951.

It is a cyclic number.

It is not a de Polignac number, because 16220989 - 2¹¹ = 16218941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16220189) 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, 1702 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (4057264).

Almost surely, 2^16220989 is an apocalyptic number.

It is an amenable number.

16220989 is a deficient number, since it is larger than the sum of its proper divisors (8067).

16220989 is an equidigital number, since it uses as much as digits as its factorization.

16220989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8066.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16220989 is about 4027.5288949926. The cubic root of 16220989 is about 253.1390290248.

The spelling of 16220989 in words is "sixteen million, two hundred twenty thousand, nine hundred eighty-nine".