222445440 has 320 divisors, whose sum is σ = 909358560. Its totient is φ = 50761728.

The previous prime is 222445423. The next prime is 222445441. The reversal of 222445440 is 44544222.

It is a tau number, because it is divible by the number of its divisors (320).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222445441) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 362574 + ... + 363186.

Almost surely, 2^222445440 is an apocalyptic number.

222445440 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 222445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454679280).

222445440 is an abundant number, since it is smaller than the sum of its proper divisors (686913120).

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

222445440 is an equidigital number, since it uses as much as digits as its factorization.

222445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 27.

The square root of 222445440 is about 14914.6049226924. The cubic root of 222445440 is about 605.9096032205.

Adding to 222445440 its reverse (44544222), we get a palindrome (266989662).

The spelling of 222445440 in words is "two hundred twenty-two million, four hundred forty-five thousand, four hundred forty".