16145989 has 4 divisors (see below), whose sum is σ = 16178220. Its totient is φ = 16113760.

The previous prime is 16145963. The next prime is 16145993. The reversal of 16145989 is 98954161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98954161 = 17 ⋅5820833.

It can be written as a sum of positive squares in 2 ways, for example, as 5841889 + 10304100 = 2417^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 16145989 - 2⁹ = 16145477 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 (16145959) 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, 15352 + ... + 16369.

It is an arithmetic number, because the mean of its divisors is an integer number (4044555).

Almost surely, 2^16145989 is an apocalyptic number.

It is an amenable number.

16145989 is a deficient number, since it is larger than the sum of its proper divisors (32231).

16145989 is an equidigital number, since it uses as much as digits as its factorization.

16145989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32230.

The product of its digits is 77760, while the sum is 43.

The square root of 16145989 is about 4018.2071872914. The cubic root of 16145989 is about 252.7482850088.

The spelling of 16145989 in words is "sixteen million, one hundred forty-five thousand, nine hundred eighty-nine".