15222000 has 160 divisors (see below), whose sum is σ = 51068160. Its totient is φ = 3897600.

The previous prime is 15221963. The next prime is 15222041. The reversal of 15222000 is 22251.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257971 + ... + 258029.

It is an arithmetic number, because the mean of its divisors is an integer number (319176).

Almost surely, 2^15222000 is an apocalyptic number.

15222000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25534080).

15222000 is an abundant number, since it is smaller than the sum of its proper divisors (35846160).

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

15222000 is a wasteful number, since it uses less digits than its factorization.

15222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 15222000 is about 3901.5381582140. The cubic root of 15222000 is about 247.8319187141.

Adding to 15222000 its reverse (22251), we get a palindrome (15244251).

The spelling of 15222000 in words is "fifteen million, two hundred twenty-two thousand".