423642503 has 4 divisors (see below), whose sum is σ = 424403640. Its totient is φ = 422881368.

The previous prime is 423642473. The next prime is 423642511. The reversal of 423642503 is 305246324.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 423642503 - 2²⁸ = 155207047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423642103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379733 + ... + 380846.

It is an arithmetic number, because the mean of its divisors is an integer number (106100910).

Almost surely, 2^423642503 is an apocalyptic number.

423642503 is a deficient number, since it is larger than the sum of its proper divisors (761137).

423642503 is an equidigital number, since it uses as much as digits as its factorization.

423642503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761136.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 423642503 is about 20582.5776568437. The cubic root of 423642503 is about 751.0459498257.

Adding to 423642503 its reverse (305246324), we get a palindrome (728888827).

The spelling of 423642503 in words is "four hundred twenty-three million, six hundred forty-two thousand, five hundred three".