15021989 has 8 divisors (see below), whose sum is σ = 15855840. Its totient is φ = 14192496.

The previous prime is 15021961. The next prime is 15021997. The reversal of 15021989 is 98912051.

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 15021989 - 2²⁰ = 13973413 is a prime.

It is a super-2 number, since 2×15021989² = 451320307032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15021689) 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, 8027 + ... + 9719.

It is an arithmetic number, because the mean of its divisors is an integer number (1981980).

Almost surely, 2^15021989 is an apocalyptic number.

15021989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15021989 is a deficient number, since it is larger than the sum of its proper divisors (833851).

15021989 is a wasteful number, since it uses less digits than its factorization.

15021989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 15021989 is about 3875.8210743015. The cubic root of 15021989 is about 246.7416586773.

The spelling of 15021989 in words is "fifteen million, twenty-one thousand, nine hundred eighty-nine".