421365644 has 24 divisors (see below), whose sum is σ = 845623968. Its totient is φ = 179965440.

The previous prime is 421365629. The next prime is 421365649. The reversal of 421365644 is 446563124.

It is not an unprimeable number, because it can be changed into a prime (421365649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17477 + ... + 33884.

It is an arithmetic number, because the mean of its divisors is an integer number (35234332).

Almost surely, 2^421365644 is an apocalyptic number.

It is an amenable number.

421365644 is an abundant number, since it is smaller than the sum of its proper divisors (424258324).

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

421365644 is a wasteful number, since it uses less digits than its factorization.

421365644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51665 (or 51663 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 421365644 is about 20527.1927939502. The cubic root of 421365644 is about 749.6980378489.

The spelling of 421365644 in words is "four hundred twenty-one million, three hundred sixty-five thousand, six hundred forty-four".