421388775 has 72 divisors (see below), whose sum is σ = 818947584. Its totient is φ = 206284800.

The previous prime is 421388771. The next prime is 421388789. The reversal of 421388775 is 577883124.

It is not a de Polignac number, because 421388775 - 2² = 421388771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 421388775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421388771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 155482 + ... + 158168.

It is an arithmetic number, because the mean of its divisors is an integer number (11374272).

Almost surely, 2^421388775 is an apocalyptic number.

421388775 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

421388775 is a deficient number, since it is larger than the sum of its proper divisors (397558809).

421388775 is a wasteful number, since it uses less digits than its factorization.

421388775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761 (or 2753 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 421388775 is about 20527.7562095812. The cubic root of 421388775 is about 749.7117559013.

The spelling of 421388775 in words is "four hundred twenty-one million, three hundred eighty-eight thousand, seven hundred seventy-five".