421736 has 32 divisors (see below), whose sum is σ = 959040. Its totient is φ = 169728.

The previous prime is 421727. The next prime is 421739. The reversal of 421736 is 637124.

It is a super-2 number, since 2×421736² = 355722507392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421739) by changing a digit.

421736 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (29970).

2⁴²¹⁷³⁶ 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 421736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479520).

421736 is an abundant number, since it is smaller than the sum of its proper divisors (537304).

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

421736 is a wasteful number, since it uses less digits than its factorization.

421736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 469 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 421736 is about 649.4120417732. The cubic root of 421736 is about 74.9917620581.

The spelling of 421736 in words is "four hundred twenty-one thousand, seven hundred thirty-six".