421456 has 40 divisors (see below), whose sum is σ = 964224. Its totient is φ = 174720.

The previous prime is 421453. The next prime is 421459. The reversal of 421456 is 654124.

It is an interprime number because it is at equal distance from previous prime (421453) and next prime (421459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421453) 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, 5901 + ... + 5971.

2⁴²¹⁴⁵⁶ 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 421456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (482112).

421456 is an abundant number, since it is smaller than the sum of its proper divisors (542768).

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

421456 is a wasteful number, since it uses less digits than its factorization.

421456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 133 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 421456 is about 649.1964263611. The cubic root of 421456 is about 74.9751621457.

The spelling of 421456 in words is "four hundred twenty-one thousand, four hundred fifty-six".