421323644 has 12 divisors (see below), whose sum is σ = 842647344. Its totient is φ = 180567264.

The previous prime is 421323601. The next prime is 421323647. The reversal of 421323644 is 446323124.

421323644 is an admirable number.

It is a super-2 number, since 2×421323644² = 355027225986877472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421323647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7523609 + ... + 7523664.

It is an arithmetic number, because the mean of its divisors is an integer number (70220612).

Almost surely, 2^421323644 is an apocalyptic number.

It is an amenable number.

421323644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

421323644 is a wasteful number, since it uses less digits than its factorization.

421323644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15047284 (or 15047282 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

The square root of 421323644 is about 20526.1697352429. The cubic root of 421323644 is about 749.6731280789.

Adding to 421323644 its reverse (446323124), we get a palindrome (867646768).

The spelling of 421323644 in words is "four hundred twenty-one million, three hundred twenty-three thousand, six hundred forty-four".