421304240 has 80 divisors (see below), whose sum is σ = 1143355392. Its totient is φ = 141364992.

The previous prime is 421304231. The next prime is 421304267. The reversal of 421304240 is 42403124.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18317 + ... + 34323.

Almost surely, 2^421304240 is an apocalyptic number.

421304240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421304240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571677696).

421304240 is an abundant number, since it is smaller than the sum of its proper divisors (722051152).

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

421304240 is a wasteful number, since it uses less digits than its factorization.

421304240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16074 (or 16068 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421304240 is about 20525.6970648989. The cubic root of 421304240 is about 749.6616192061.

Adding to 421304240 its reverse (42403124), we get a palindrome (463707364).

The spelling of 421304240 in words is "four hundred twenty-one million, three hundred four thousand, two hundred forty".