421878192 has 60 divisors (see below), whose sum is σ = 1118850264. Its totient is φ = 136899840.

The previous prime is 421878161. The next prime is 421878229. The reversal of 421878192 is 291878124.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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 in 11 ways as a sum of consecutive naturals, for example, 910953 + ... + 911415.

Almost surely, 2^421878192 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 421878192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559425132).

421878192 is an abundant number, since it is smaller than the sum of its proper divisors (696972072).

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

421878192 is an equidigital number, since it uses as much as digits as its factorization.

421878192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 509 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 421878192 is about 20539.6736098702. The cubic root of 421878192 is about 750.0018915508.

The spelling of 421878192 in words is "four hundred twenty-one million, eight hundred seventy-eight thousand, one hundred ninety-two".