15221394 has 24 divisors (see below), whose sum is σ = 34716240. Its totient is φ = 4806648.

The previous prime is 15221387. The next prime is 15221399. The reversal of 15221394 is 49312251.

15221394 is a `hidden beast` number, since 1 + 522 + 139 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (15221399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21912 + ... + 22595.

It is an arithmetic number, because the mean of its divisors is an integer number (1446510).

Almost surely, 2^15221394 is an apocalyptic number.

15221394 is an abundant number, since it is smaller than the sum of its proper divisors (19494846).

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

15221394 is a wasteful number, since it uses less digits than its factorization.

15221394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44534 (or 44531 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 15221394 is about 3901.4604957631. The cubic root of 15221394 is about 247.8286298747.

It can be divided in two parts, 1522 and 1394, that added together give a square (2916 = 54²).

The spelling of 15221394 in words is "fifteen million, two hundred twenty-one thousand, three hundred ninety-four".