421991964 has 96 divisors (see below), whose sum is σ = 1136199680. Its totient is φ = 135302400.

The previous prime is 421991953. The next prime is 421992007. The reversal of 421991964 is 469199124.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 806607 + ... + 807129.

Almost surely, 2^421991964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421991964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (568099840).

421991964 is an abundant number, since it is smaller than the sum of its proper divisors (714207716).

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

421991964 is a wasteful number, since it uses less digits than its factorization.

421991964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808 (or 800 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 421991964 is about 20542.4429900633. The cubic root of 421991964 is about 750.0693055954.

The spelling of 421991964 in words is "four hundred twenty-one million, nine hundred ninety-one thousand, nine hundred sixty-four".