18928535393 has 8 divisors (see below), whose sum is σ = 19583867880. Its totient is φ = 18273377920.

The previous prime is 18928535387. The next prime is 18928535411. The reversal of 18928535393 is 39353582981.

It can be written as a sum of positive squares in 4 ways, for example, as 9018731089 + 9909804304 = 94967^2 + 99548^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-18928535393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18928535693) 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, 199253 + ... + 278493.

It is an arithmetic number, because the mean of its divisors is an integer number (2447983485).

Almost surely, 2^18928535393 is an apocalyptic number.

It is an amenable number.

18928535393 is a deficient number, since it is larger than the sum of its proper divisors (655332487).

18928535393 is an equidigital number, since it uses as much as digits as its factorization.

18928535393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87507.

The product of its digits is 6998400, while the sum is 56.

The spelling of 18928535393 in words is "eighteen billion, nine hundred twenty-eight million, five hundred thirty-five thousand, three hundred ninety-three".