18391893073 has 8 divisors (see below), whose sum is σ = 18421946280. Its totient is φ = 18361860480.

The previous prime is 18391893053. The next prime is 18391893083. The reversal of 18391893073 is 37039819381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9112038849 + 9279854224 = 95457^2 + 96332^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18391893073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18391893073.

It is not an unprimeable number, because it can be changed into a prime (18391893043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3493263 + ... + 3498523.

It is an arithmetic number, because the mean of its divisors is an integer number (2302743285).

Almost surely, 2^18391893073 is an apocalyptic number.

It is an amenable number.

18391893073 is a deficient number, since it is larger than the sum of its proper divisors (30053207).

18391893073 is an equidigital number, since it uses as much as digits as its factorization.

18391893073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10307.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 18391893073 in words is "eighteen billion, three hundred ninety-one million, eight hundred ninety-three thousand, seventy-three".