421998 has 16 divisors (see below), whose sum is σ = 858576. Its totient is φ = 138240.

The previous prime is 421997. The next prime is 422029. The reversal of 421998 is 899124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421997) 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, 211 + ... + 942.

It is an arithmetic number, because the mean of its divisors is an integer number (53661).

2⁴²¹⁹⁹⁸ is an apocalyptic number.

421998 is an abundant number, since it is smaller than the sum of its proper divisors (436578).

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

421998 is a wasteful number, since it uses less digits than its factorization.

421998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219.

The product of its digits is 5184, while the sum is 33.

The square root of 421998 is about 649.6137313820. The cubic root of 421998 is about 75.0072881806.

The spelling of 421998 in words is "four hundred twenty-one thousand, nine hundred ninety-eight".