423640231 has 6 divisors (see below), whose sum is σ = 492806040. Its totient is φ = 363120156.

The previous prime is 423640229. The next prime is 423640247. The reversal of 423640231 is 132046324.

It is not a de Polignac number, because 423640231 - 2¹ = 423640229 is a prime.

It is a super-3 number, since 3×423640231³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423640196 and 423640205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423640291) 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 5 ways as a sum of consecutive naturals, for example, 4322811 + ... + 4322908.

It is an arithmetic number, because the mean of its divisors is an integer number (82134340).

Almost surely, 2^423640231 is an apocalyptic number.

423640231 is a deficient number, since it is larger than the sum of its proper divisors (69165809).

423640231 is an equidigital number, since it uses as much as digits as its factorization.

423640231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645733 (or 8645726 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 423640231 is about 20582.5224644600. The cubic root of 423640231 is about 751.0446072004.

Adding to 423640231 its reverse (132046324), we get a palindrome (555686555).

The spelling of 423640231 in words is "four hundred twenty-three million, six hundred forty thousand, two hundred thirty-one".