15222042 has 72 divisors (see below), whose sum is σ = 37657620. Its totient is φ = 4435200.

The previous prime is 15222041. The next prime is 15222049. The reversal of 15222042 is 24022251.

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 314721 = 3861^2 + 561^2 .

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

It is not an unprimeable number, because it can be changed into a prime (15222041) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 63042 + ... + 63282.

Almost surely, 2^15222042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15222042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18828810).

15222042 is an abundant number, since it is smaller than the sum of its proper divisors (22435578).

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

15222042 is a wasteful number, since it uses less digits than its factorization.

15222042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 286 counting only the distinct ones).

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

The square root of 15222042 is about 3901.5435407028. The cubic root of 15222042 is about 247.8321466502.

Adding to 15222042 its reverse (24022251), we get a palindrome (39244293).

The spelling of 15222042 in words is "fifteen million, two hundred twenty-two thousand, forty-two".