421278 has 32 divisors (see below), whose sum is σ = 991872. Its totient is φ = 117600.

The previous prime is 421273. The next prime is 421279. The reversal of 421278 is 872124.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (30996).

2⁴²¹²⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495936).

421278 is an abundant number, since it is smaller than the sum of its proper divisors (570594).

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

421278 is a wasteful number, since it uses less digits than its factorization.

421278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 896, while the sum is 24.

The square root of 421278 is about 649.0593193230. The cubic root of 421278 is about 74.9646055213.

The spelling of 421278 in words is "four hundred twenty-one thousand, two hundred seventy-eight".