421578432 has 140 divisors (see below), whose sum is σ = 1363483176. Its totient is φ = 127733760.

The previous prime is 421578419. The next prime is 421578433. The reversal of 421578432 is 234875124.

It is a happy number.

421578432 is a `hidden beast` number, since 4 + 215 + 7 + 8 + 432 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (421578433) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 53328 + ... + 60720.

Almost surely, 2^421578432 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 421578432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681741588).

421578432 is an abundant number, since it is smaller than the sum of its proper divisors (941904744).

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

421578432 is a wasteful number, since it uses less digits than its factorization.

421578432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7428 (or 7409 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 421578432 is about 20532.3752157416. The cubic root of 421578432 is about 749.8242148026.

The spelling of 421578432 in words is "four hundred twenty-one million, five hundred seventy-eight thousand, four hundred thirty-two".