15429989 has 2 divisors, whose sum is σ = 15429990. Its totient is φ = 15429988.

The previous prime is 15429977. The next prime is 15430007. The reversal of 15429989 is 98992451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 2592100 = 3583^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 15429989 - 2²⁰ = 14381413 is a prime.

It is a Sophie Germain 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 (15429929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7714994 + 7714995.

It is an arithmetic number, because the mean of its divisors is an integer number (7714995).

Almost surely, 2^15429989 is an apocalyptic number.

It is an amenable number.

15429989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15429989 is an equidigital number, since it uses as much as digits as its factorization.

15429989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 15429989 is about 3928.1024681136. The cubic root of 15429989 is about 248.9555841918.

The spelling of 15429989 in words is "fifteen million, four hundred twenty-nine thousand, nine hundred eighty-nine".