15382221 has 16 divisors (see below), whose sum is σ = 20953728. Its totient is φ = 10035200.

The previous prime is 15382217. The next prime is 15382271. The reversal of 15382221 is 12228351.

It is a 7-Lehmer number, since φ(15382221) divides (15382221-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 15382221 - 2² = 15382217 is a prime.

It is a super-2 number, since 2×15382221² = 473225445785682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15382191 and 15382200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15382271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54601 + ... + 54881.

It is an arithmetic number, because the mean of its divisors is an integer number (1309608).

Almost surely, 2^15382221 is an apocalyptic number.

It is an amenable number.

15382221 is a deficient number, since it is larger than the sum of its proper divisors (5571507).

15382221 is a wasteful number, since it uses less digits than its factorization.

15382221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its digits is 960, while the sum is 24.

The square root of 15382221 is about 3922.0174655399. The cubic root of 15382221 is about 248.6984139217.

The spelling of 15382221 in words is "fifteen million, three hundred eighty-two thousand, two hundred twenty-one".