423623641 has 4 divisors (see below), whose sum is σ = 484141312. Its totient is φ = 363105972.

The previous prime is 423623633. The next prime is 423623671. The reversal of 423623641 is 146326324.

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 423623641 - 2³ = 423623633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423623611) 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, 30258825 + ... + 30258838.

It is an arithmetic number, because the mean of its divisors is an integer number (121035328).

Almost surely, 2^423623641 is an apocalyptic number.

It is an amenable number.

423623641 is a deficient number, since it is larger than the sum of its proper divisors (60517671).

423623641 is an equidigital number, since it uses as much as digits as its factorization.

423623641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60517670.

The product of its digits is 20736, while the sum is 31.

The square root of 423623641 is about 20582.1194486865. The cubic root of 423623641 is about 751.0348032899.

Adding to 423623641 its reverse (146326324), we get a palindrome (569949965).

The spelling of 423623641 in words is "four hundred twenty-three million, six hundred twenty-three thousand, six hundred forty-one".