421902 has 32 divisors (see below), whose sum is σ = 1011360. Its totient is φ = 129600.

The previous prime is 421891. The next prime is 421907. The reversal of 421902 is 209124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421907) by changing a digit.

421902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402 + ... + 1002.

It is an arithmetic number, because the mean of its divisors is an integer number (31605).

2⁴²¹⁹⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505680).

421902 is an abundant number, since it is smaller than the sum of its proper divisors (589458).

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

421902 is a wasteful number, since it uses less digits than its factorization.

421902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 421902 is about 649.5398371155. The cubic root of 421902 is about 75.0015999659.

The spelling of 421902 in words is "four hundred twenty-one thousand, nine hundred two".