15990889 has 4 divisors (see below), whose sum is σ = 16019856. Its totient is φ = 15961924.

The previous prime is 15990881. The next prime is 15990899. The reversal of 15990889 is 98809951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15990889 - 2³ = 15990881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15990881) 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, 13639 + ... + 14764.

It is an arithmetic number, because the mean of its divisors is an integer number (4004964).

Almost surely, 2^15990889 is an apocalyptic number.

It is an amenable number.

15990889 is a deficient number, since it is larger than the sum of its proper divisors (28967).

15990889 is an equidigital number, since it uses as much as digits as its factorization.

15990889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28966.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 15990889 is about 3998.8609628243. The cubic root of 15990889 is about 251.9363711446.

The spelling of 15990889 in words is "fifteen million, nine hundred ninety thousand, eight hundred eighty-nine".