421836 has 12 divisors (see below), whose sum is σ = 984312. Its totient is φ = 140608.

The previous prime is 421831. The next prime is 421847. The reversal of 421836 is 638124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×421836² = 355891221792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (421831) by changing a digit.

421836 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 3 ways as a sum of consecutive naturals, for example, 17565 + ... + 17588.

It is an arithmetic number, because the mean of its divisors is an integer number (82026).

2⁴²¹⁸³⁶ is an apocalyptic number.

It is an amenable number.

421836 is an abundant number, since it is smaller than the sum of its proper divisors (562476).

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

421836 is a wasteful number, since it uses less digits than its factorization.

421836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35160 (or 35158 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 421836 is about 649.4890299305. The cubic root of 421836 is about 74.9976888177.

The spelling of 421836 in words is "four hundred twenty-one thousand, eight hundred thirty-six".