15489979 has 2 divisors, whose sum is σ = 15489980. Its totient is φ = 15489978.

The previous prime is 15489953. The next prime is 15490001. The reversal of 15489979 is 97998451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15489979 - 2¹¹ = 15487931 is a prime.

It is not a weakly prime, because it can be changed into another prime (15489949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7744989 + 7744990.

It is an arithmetic number, because the mean of its divisors is an integer number (7744990).

Almost surely, 2^15489979 is an apocalyptic number.

15489979 is a deficient number, since it is larger than the sum of its proper divisors (1).

15489979 is an equidigital number, since it uses as much as digits as its factorization.

15489979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 15489979 is about 3935.7310629666. The cubic root of 15489979 is about 249.2778037392.

The spelling of 15489979 in words is "fifteen million, four hundred eighty-nine thousand, nine hundred seventy-nine".