422556978 has 16 divisors (see below), whose sum is σ = 863095680. Its totient is φ = 137855376.

The previous prime is 422556973. The next prime is 422557061. The reversal of 422556978 is 879655224.

It is not an unprimeable number, because it can be changed into a prime (422556973) 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, 748933 + ... + 749496.

It is an arithmetic number, because the mean of its divisors is an integer number (53943480).

Almost surely, 2^422556978 is an apocalyptic number.

422556978 is an abundant number, since it is smaller than the sum of its proper divisors (440538702).

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

422556978 is a wasteful number, since it uses less digits than its factorization.

422556978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498481.

The product of its digits is 1209600, while the sum is 48.

The square root of 422556978 is about 20556.1907463421. The cubic root of 422556978 is about 750.4039175396.

The spelling of 422556978 in words is "four hundred twenty-two million, five hundred fifty-six thousand, nine hundred seventy-eight".