222142440 has 128 divisors (see below), whose sum is σ = 723058560. Its totient is φ = 54273024.

The previous prime is 222142439. The next prime is 222142447. The reversal of 222142440 is 44241222.

It is not an unprimeable number, because it can be changed into a prime (222142447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244467 + ... + 245373.

It is an arithmetic number, because the mean of its divisors is an integer number (5648895).

Almost surely, 2^222142440 is an apocalyptic number.

222142440 is a gapful number since it is divisible by the number (20) 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 222142440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361529280).

222142440 is an abundant number, since it is smaller than the sum of its proper divisors (500916120).

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

222142440 is a wasteful number, since it uses less digits than its factorization.

222142440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 222142440 is about 14904.4436326889. The cubic root of 222142440 is about 605.6343686414.

Adding to 222142440 its reverse (44241222), we get a palindrome (266383662).

The spelling of 222142440 in words is "two hundred twenty-two million, one hundred forty-two thousand, four hundred forty".