15189989 has 4 divisors (see below), whose sum is σ = 15253260. Its totient is φ = 15126720.

The previous prime is 15189983. The next prime is 15189991. The reversal of 15189989 is 98998151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 1809025 = 3658^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 15189989 - 2¹² = 15185893 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 (15189983) 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, 31274 + ... + 31755.

It is an arithmetic number, because the mean of its divisors is an integer number (3813315).

Almost surely, 2^15189989 is an apocalyptic number.

It is an amenable number.

15189989 is a deficient number, since it is larger than the sum of its proper divisors (63271).

15189989 is an equidigital number, since it uses as much as digits as its factorization.

15189989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63270.

The product of its digits is 233280, while the sum is 50.

The square root of 15189989 is about 3897.4336427962. The cubic root of 15189989 is about 247.6580713181.

The spelling of 15189989 in words is "fifteen million, one hundred eighty-nine thousand, nine hundred eighty-nine".