15222207 has 64 divisors (see below), whose sum is σ = 28191744. Its totient is φ = 7050240.

The previous prime is 15222197. The next prime is 15222223. The reversal of 15222207 is 70222251.

It is a happy number.

It is not a de Polignac number, because 15222207 - 2⁶ = 15222143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15222227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 111043 + ... + 111179.

It is an arithmetic number, because the mean of its divisors is an integer number (440496).

Almost surely, 2^15222207 is an apocalyptic number.

15222207 is a deficient number, since it is larger than the sum of its proper divisors (12969537).

15222207 is a wasteful number, since it uses less digits than its factorization.

15222207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 15222207 is about 3901.5646861227. The cubic root of 15222207 is about 247.8330421095.

Adding to 15222207 its reverse (70222251), we get a palindrome (85444458).

It can be divided in two parts, 15 and 222207, that added together give a palindrome (222222).

The spelling of 15222207 in words is "fifteen million, two hundred twenty-two thousand, two hundred seven".