421405452 has 72 divisors (see below), whose sum is σ = 1214662176. Its totient is φ = 122033664.

The previous prime is 421405433. The next prime is 421405459. The reversal of 421405452 is 254504124.

It is not an unprimeable number, because it can be changed into a prime (421405459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18528 + ... + 34439.

It is an arithmetic number, because the mean of its divisors is an integer number (16870308).

Almost surely, 2^421405452 is an apocalyptic number.

It is an amenable number.

421405452 is an abundant number, since it is smaller than the sum of its proper divisors (793256724).

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

421405452 is a wasteful number, since it uses less digits than its factorization.

421405452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53007 (or 53002 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 421405452 is about 20528.1624116724. The cubic root of 421405452 is about 749.7216460382.

Adding to 421405452 its reverse (254504124), we get a palindrome (675909576).

The spelling of 421405452 in words is "four hundred twenty-one million, four hundred five thousand, four hundred fifty-two".