15990389 has 8 divisors (see below), whose sum is σ = 16561920. Its totient is φ = 15422400.

The previous prime is 15990361. The next prime is 15990427. The reversal of 15990389 is 98309951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15990389 - 2¹² = 15986293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15990089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11069 + ... + 12429.

It is an arithmetic number, because the mean of its divisors is an integer number (2070240).

Almost surely, 2^15990389 is an apocalyptic number.

It is an amenable number.

15990389 is a deficient number, since it is larger than the sum of its proper divisors (571531).

15990389 is a wasteful number, since it uses less digits than its factorization.

15990389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 15990389 is about 3998.7984445331. The cubic root of 15990389 is about 251.9337452847.

The spelling of 15990389 in words is "fifteen million, nine hundred ninety thousand, three hundred eighty-nine".