421025440 has 96 divisors (see below), whose sum is σ = 1093538880. Its totient is φ = 151910400.

The previous prime is 421025413. The next prime is 421025453. The reversal of 421025440 is 44520124.

It is a happy number.

It is a super-2 number, since 2×421025440² = 354524842254387200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 243780 + ... + 245500.

It is an arithmetic number, because the mean of its divisors is an integer number (11391030).

Almost surely, 2^421025440 is an apocalyptic number.

421025440 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 421025440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546769440).

421025440 is an abundant number, since it is smaller than the sum of its proper divisors (672513440).

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

421025440 is a wasteful number, since it uses less digits than its factorization.

421025440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 421025440 is about 20518.9044541857. The cubic root of 421025440 is about 749.4962187187.

Adding to 421025440 its reverse (44520124), we get a palindrome (465545564).

The spelling of 421025440 in words is "four hundred twenty-one million, twenty-five thousand, four hundred forty".