15222222 has 16 divisors (see below), whose sum is σ = 33827280. Its totient is φ = 5074056.

The previous prime is 15222197. The next prime is 15222223. The reversal of 15222222 is 22222251.

15222222 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

15222222 is a modest number, since divided by 2222 gives 1522 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 15222195 and 15222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15222223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140893 + ... + 141000.

It is an arithmetic number, because the mean of its divisors is an integer number (2114205).

Almost surely, 2^15222222 is an apocalyptic number.

15222222 is an abundant number, since it is smaller than the sum of its proper divisors (18605058).

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

15222222 is a wasteful number, since it uses less digits than its factorization.

15222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281904 (or 281898 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 15222222 is about 3901.5666084280. The cubic root of 15222222 is about 247.8331235145.

Adding to 15222222 its reverse (22222251), we get a palindrome (37444473).

The spelling of 15222222 in words is "fifteen million, two hundred twenty-two thousand, two hundred twenty-two".