42222440 has 32 divisors (see below), whose sum is σ = 102309480. Its totient is φ = 15589632.

The previous prime is 42222437. The next prime is 42222473. The reversal of 42222440 is 4422224.

It can be written as a sum of positive squares in 4 ways, for example, as 28665316 + 13557124 = 5354^2 + 3682^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40079 + ... + 41118.

Almost surely, 2^42222440 is an apocalyptic number.

42222440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42222440 is an abundant number, since it is smaller than the sum of its proper divisors (60087040).

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

42222440 is a wasteful number, since it uses less digits than its factorization.

42222440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81221 (or 81217 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 42222440 is about 6497.8796541641. The cubic root of 42222440 is about 348.2152409579.

Adding to 42222440 its reverse (4422224), we get a palindrome (46644664).

The spelling of 42222440 in words is "forty-two million, two hundred twenty-two thousand, four hundred forty".