422891818 has 4 divisors (see below), whose sum is σ = 634337730. Its totient is φ = 211445908.

The previous prime is 422891809. The next prime is 422891837. The reversal of 422891818 is 818198224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 337199769 + 85692049 = 18363^2 + 9257^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105722953 + ... + 105722956.

Almost surely, 2^422891818 is an apocalyptic number.

422891818 is a deficient number, since it is larger than the sum of its proper divisors (211445912).

422891818 is a wasteful number, since it uses less digits than its factorization.

422891818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211445911.

The product of its digits is 73728, while the sum is 43.

The square root of 422891818 is about 20564.3336386084. Note that the first 3 decimals coincide. The cubic root of 422891818 is about 750.6020753592.

The spelling of 422891818 in words is "four hundred twenty-two million, eight hundred ninety-one thousand, eight hundred eighteen".