420894018 has 48 divisors (see below), whose sum is σ = 939155256. Its totient is φ = 136131840.

The previous prime is 420894013. The next prime is 420894029. The reversal of 420894018 is 810498024.

It can be written as a sum of positive squares in 4 ways, for example, as 299739969 + 121154049 = 17313^2 + 11007^2 .

It is not an unprimeable number, because it can be changed into a prime (420894013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346380 + ... + 347592.

Almost surely, 2^420894018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420894018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469577628).

420894018 is an abundant number, since it is smaller than the sum of its proper divisors (518261238).

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

420894018 is a wasteful number, since it uses less digits than its factorization.

420894018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1776 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 420894018 is about 20515.7017428115. The cubic root of 420894018 is about 749.4182261690.

The spelling of 420894018 in words is "four hundred twenty million, eight hundred ninety-four thousand, eighteen".