421808893 has 4 divisors (see below), whose sum is σ = 460155168. Its totient is φ = 383462620.

The previous prime is 421808831. The next prime is 421808897. The reversal of 421808893 is 398808124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421808893 - 2¹⁷ = 421677821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421808897) 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, 19173121 + ... + 19173142.

It is an arithmetic number, because the mean of its divisors is an integer number (115038792).

Almost surely, 2^421808893 is an apocalyptic number.

It is an amenable number.

421808893 is a deficient number, since it is larger than the sum of its proper divisors (38346275).

421808893 is a wasteful number, since it uses less digits than its factorization.

421808893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38346274.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 421808893 is about 20537.9865858365. The cubic root of 421808893 is about 749.9608234351.

The spelling of 421808893 in words is "four hundred twenty-one million, eight hundred eight thousand, eight hundred ninety-three".