15221984 has 48 divisors (see below), whose sum is σ = 31752000. Its totient is φ = 7171584.

The previous prime is 15221963. The next prime is 15222041. The reversal of 15221984 is 48912251.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 15221984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43442 + ... + 43790.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^15221984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15221984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15876000).

15221984 is an abundant number, since it is smaller than the sum of its proper divisors (16530016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15221984 is a wasteful number, since it uses less digits than its factorization.

15221984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 427 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 15221984 is about 3901.5361077401. The cubic root of 15221984 is about 247.8318318811.

The spelling of 15221984 in words is "fifteen million, two hundred twenty-one thousand, nine hundred eighty-four".