15279989 has 2 divisors, whose sum is σ = 15279990. Its totient is φ = 15279988.

The previous prime is 15279961. The next prime is 15280033. The reversal of 15279989 is 98997251.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 1067089 = 3770^2 + 1033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15279989 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15279689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7639994 + 7639995.

It is an arithmetic number, because the mean of its divisors is an integer number (7639995).

Almost surely, 2^15279989 is an apocalyptic number.

It is an amenable number.

15279989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15279989 is an equidigital number, since it uses as much as digits as its factorization.

15279989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 15279989 is about 3908.9626501158. The cubic root of 15279989 is about 248.1462294479.

The spelling of 15279989 in words is "fifteen million, two hundred seventy-nine thousand, nine hundred eighty-nine".