15887489 has 2 divisors, whose sum is σ = 15887490. Its totient is φ = 15887488.

The previous prime is 15887449. The next prime is 15887491. The reversal of 15887489 is 98478851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 47089 = 3980^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 15887489 - 2⁸ = 15887233 is a prime.

Together with 15887491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15887419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7943744 + 7943745.

It is an arithmetic number, because the mean of its divisors is an integer number (7943745).

Almost surely, 2^15887489 is an apocalyptic number.

It is an amenable number.

15887489 is a deficient number, since it is larger than the sum of its proper divisors (1).

15887489 is an equidigital number, since it uses as much as digits as its factorization.

15887489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 50.

The square root of 15887489 is about 3985.9113136145. The cubic root of 15887489 is about 251.3921743451.

The spelling of 15887489 in words is "fifteen million, eight hundred eighty-seven thousand, four hundred eighty-nine".