423821631 has 32 divisors (see below), whose sum is σ = 602300160. Its totient is φ = 264628224.

The previous prime is 423821627. The next prime is 423821639. The reversal of 423821631 is 136128324.

It is not a de Polignac number, because 423821631 - 2² = 423821627 is a prime.

It is a super-2 number, since 2×423821631² = 359249549807000322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423821639) by changing a digit.

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, 721720 + ... + 722306.

It is an arithmetic number, because the mean of its divisors is an integer number (18821880).

Almost surely, 2^423821631 is an apocalyptic number.

423821631 is a deficient number, since it is larger than the sum of its proper divisors (178478529).

423821631 is a wasteful number, since it uses less digits than its factorization.

423821631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855.

The product of its digits is 6912, while the sum is 30.

The square root of 423821631 is about 20586.9286441664. The cubic root of 423821631 is about 751.1517893806.

Adding to 423821631 its reverse (136128324), we get a palindrome (559949955).

The spelling of 423821631 in words is "four hundred twenty-three million, eight hundred twenty-one thousand, six hundred thirty-one".