422197820 has 48 divisors (see below), whose sum is σ = 981687168. Its totient is φ = 151229760.

The previous prime is 422197819. The next prime is 422197837. The reversal of 422197820 is 28791224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419 + ... + 29061.

It is an arithmetic number, because the mean of its divisors is an integer number (20451816).

Almost surely, 2^422197820 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 422197820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (490843584).

422197820 is an abundant number, since it is smaller than the sum of its proper divisors (559489348).

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

422197820 is a wasteful number, since it uses less digits than its factorization.

422197820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28730 (or 28728 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 422197820 is about 20547.4528835085. The cubic root of 422197820 is about 750.1912519668.

The spelling of 422197820 in words is "four hundred twenty-two million, one hundred ninety-seven thousand, eight hundred twenty".