421805688 has 16 divisors (see below), whose sum is σ = 1054514280. Its totient is φ = 140601888.

The previous prime is 421805677. The next prime is 421805689. The reversal of 421805688 is 886508124.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421805689) 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, 8787595 + ... + 8787642.

Almost surely, 2^421805688 is an apocalyptic number.

It is an amenable number.

421805688 is an abundant number, since it is smaller than the sum of its proper divisors (632708592).

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

421805688 is a wasteful number, since it uses less digits than its factorization.

421805688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17575246 (or 17575242 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 421805688 is about 20537.9085595394. The cubic root of 421805688 is about 749.9589239726.

The spelling of 421805688 in words is "four hundred twenty-one million, eight hundred five thousand, six hundred eighty-eight".