422445100 has 144 divisors (see below), whose sum is σ = 1158425856. Its totient is φ = 129888000.

The previous prime is 422445083. The next prime is 422445103. The reversal of 422445100 is 1544224.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (422445103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 638770 + ... + 639430.

It is an arithmetic number, because the mean of its divisors is an integer number (8044624).

Almost surely, 2^422445100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 422445100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579212928).

422445100 is an abundant number, since it is smaller than the sum of its proper divisors (735980756).

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

422445100 is a wasteful number, since it uses less digits than its factorization.

422445100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 422445100 is about 20553.4692935280. The cubic root of 422445100 is about 750.3376849727.

Adding to 422445100 its reverse (1544224), we get a palindrome (423989324).

The spelling of 422445100 in words is "four hundred twenty-two million, four hundred forty-five thousand, one hundred".