18728413231 has 4 divisors (see below), whose sum is σ = 20430996264. Its totient is φ = 17025830200.

The previous prime is 18728413213. The next prime is 18728413261. The reversal of 18728413231 is 13231482781.

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 18728413231 - 2⁹ = 18728412719 is a prime.

It is a super-2 number, since 2×18728413231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728413261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851291500 + ... + 851291521.

It is an arithmetic number, because the mean of its divisors is an integer number (5107749066).

Almost surely, 2^18728413231 is an apocalyptic number.

18728413231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18728413231 is a deficient number, since it is larger than the sum of its proper divisors (1702583033).

18728413231 is a wasteful number, since it uses less digits than its factorization.

18728413231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702583032.

The product of its digits is 64512, while the sum is 40.

The spelling of 18728413231 in words is "eighteen billion, seven hundred twenty-eight million, four hundred thirteen thousand, two hundred thirty-one".