421643244 has 48 divisors (see below), whose sum is σ = 1074519936. Its totient is φ = 127622400.

The previous prime is 421643207. The next prime is 421643263. The reversal of 421643244 is 442346124.

It is a nude number because it is divisible by every one of its digits.

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, 178479 + ... + 180825.

It is an arithmetic number, because the mean of its divisors is an integer number (22385832).

Almost surely, 2^421643244 is an apocalyptic number.

421643244 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421643244 is an abundant number, since it is smaller than the sum of its proper divisors (652876692).

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

421643244 is a wasteful number, since it uses less digits than its factorization.

421643244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726 (or 3724 counting only the distinct ones).

The product of its digits is 18432, while the sum is 30.

The square root of 421643244 is about 20533.9534430173. The cubic root of 421643244 is about 749.8626379549.

Adding to 421643244 its reverse (442346124), we get a palindrome (863989368).

The spelling of 421643244 in words is "four hundred twenty-one million, six hundred forty-three thousand, two hundred forty-four".