423121789 has 4 divisors (see below), whose sum is σ = 448011324. Its totient is φ = 398232256.

The previous prime is 423121771. The next prime is 423121807. The reversal of 423121789 is 987121324.

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

It is an interprime number because it is at equal distance from previous prime (423121771) and next prime (423121807).

It can be written as a sum of positive squares in 2 ways, for example, as 121925764 + 301196025 = 11042^2 + 17355^2 .

It is a cyclic number.

It is not a de Polignac number, because 423121789 - 2⁹ = 423121277 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 (423121729) 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, 12444742 + ... + 12444775.

It is an arithmetic number, because the mean of its divisors is an integer number (112002831).

Almost surely, 2^423121789 is an apocalyptic number.

It is an amenable number.

423121789 is a deficient number, since it is larger than the sum of its proper divisors (24889535).

423121789 is a wasteful number, since it uses less digits than its factorization.

423121789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24889534.

The product of its digits is 24192, while the sum is 37.

The square root of 423121789 is about 20569.9243800263. The cubic root of 423121789 is about 750.7381112766.

The spelling of 423121789 in words is "four hundred twenty-three million, one hundred twenty-one thousand, seven hundred eighty-nine".