18928093 has 4 divisors (see below), whose sum is σ = 18992988. Its totient is φ = 18863200.

The previous prime is 18928069. The next prime is 18928109. The reversal of 18928093 is 39082981.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17530969 + 1397124 = 4187^2 + 1182^2 .

It is a cyclic number.

It is not a de Polignac number, because 18928093 - 2⁹ = 18927581 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 (18928003) 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, 32008 + ... + 32593.

It is an arithmetic number, because the mean of its divisors is an integer number (4748247).

Almost surely, 2^18928093 is an apocalyptic number.

It is an amenable number.

18928093 is a deficient number, since it is larger than the sum of its proper divisors (64895).

18928093 is an equidigital number, since it uses as much as digits as its factorization.

18928093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64894.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 18928093 is about 4350.6428260661. The cubic root of 18928093 is about 266.5031134245.

It can be divided in two parts, 189 and 28093, that added together give a palindrome (28282).

The spelling of 18928093 in words is "eighteen million, nine hundred twenty-eight thousand, ninety-three".