422405440 has 56 divisors (see below), whose sum is σ = 1007879112. Its totient is φ = 168622080.

The previous prime is 422405377. The next prime is 422405441. The reversal of 422405440 is 44504224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11451456 + 410953984 = 3384^2 + 20272^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422405441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210522 + ... + 212518.

Almost surely, 2^422405440 is an apocalyptic number.

422405440 is a gapful number since it is divisible by the number (40) 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 422405440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503939556).

422405440 is an abundant number, since it is smaller than the sum of its proper divisors (585473672).

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

422405440 is a wasteful number, since it uses less digits than its factorization.

422405440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675 (or 2665 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 422405440 is about 20552.5044702586. The cubic root of 422405440 is about 750.3142031649.

Adding to 422405440 its reverse (44504224), we get a palindrome (466909664).

The spelling of 422405440 in words is "four hundred twenty-two million, four hundred five thousand, four hundred forty".