15798021 has 8 divisors (see below), whose sum is σ = 21171744. Its totient is φ = 10478160.

The previous prime is 15798019. The next prime is 15798031. The reversal of 15798021 is 12089751.

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

It is not a de Polignac number, because 15798021 - 2¹ = 15798019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15798031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12775 + ... + 13956.

It is an arithmetic number, because the mean of its divisors is an integer number (2646468).

Almost surely, 2^15798021 is an apocalyptic number.

It is an amenable number.

15798021 is a deficient number, since it is larger than the sum of its proper divisors (5373723).

15798021 is a wasteful number, since it uses less digits than its factorization.

15798021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26931.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 15798021 is about 3974.6724393338. The cubic root of 15798021 is about 250.9193933851.

The spelling of 15798021 in words is "fifteen million, seven hundred ninety-eight thousand, twenty-one".