15222218 has 8 divisors (see below), whose sum is σ = 24909120. Its totient is φ = 6919180.

The previous prime is 15222197. The next prime is 15222223. The reversal of 15222218 is 81222251.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15222193 and 15222202.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 345938 + ... + 345981.

It is an arithmetic number, because the mean of its divisors is an integer number (3113640).

Almost surely, 2^15222218 is an apocalyptic number.

15222218 is a deficient number, since it is larger than the sum of its proper divisors (9686902).

15222218 is a wasteful number, since it uses less digits than its factorization.

15222218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691932.

The product of its digits is 640, while the sum is 23.

The square root of 15222218 is about 3901.5660958133. The cubic root of 15222218 is about 247.8331018065.

Adding to 15222218 its reverse (81222251), we get a palindrome (96444469).

The spelling of 15222218 in words is "fifteen million, two hundred twenty-two thousand, two hundred eighteen".