422445640 has 32 divisors (see below), whose sum is σ = 954034560. Its totient is φ = 168350400.

The previous prime is 422445637. The next prime is 422445643. The reversal of 422445640 is 46544224.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (422445637) and next prime (422445643).

It is not an unprimeable number, because it can be changed into a prime (422445643) 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, 8646 + ... + 30325.

It is an arithmetic number, because the mean of its divisors is an integer number (29813580).

Almost surely, 2^422445640 is an apocalyptic number.

422445640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

422445640 is an abundant number, since it is smaller than the sum of its proper divisors (531588920).

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

422445640 is a wasteful number, since it uses less digits than its factorization.

422445640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39253 (or 39249 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

The square root of 422445640 is about 20553.4824299922. The cubic root of 422445640 is about 750.3380046846.

Adding to 422445640 its reverse (46544224), we get a palindrome (468989864).

The spelling of 422445640 in words is "four hundred twenty-two million, four hundred forty-five thousand, six hundred forty".