18140593 has 4 divisors (see below), whose sum is σ = 18153828. Its totient is φ = 18127360.

The previous prime is 18140587. The next prime is 18140597. The reversal of 18140593 is 39504181.

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 5094049 + 13046544 = 2257^2 + 3612^2 .

It is a cyclic number.

It is not a de Polignac number, because 18140593 - 2⁵ = 18140561 is a prime.

It is a super-2 number, since 2×18140593² = 658162228783298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18140597) 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, 4288 + ... + 7393.

It is an arithmetic number, because the mean of its divisors is an integer number (4538457).

Almost surely, 2^18140593 is an apocalyptic number.

It is an amenable number.

18140593 is a deficient number, since it is larger than the sum of its proper divisors (13235).

18140593 is a wasteful number, since it uses less digits than its factorization.

18140593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13234.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 18140593 is about 4259.1775027580. The cubic root of 18140593 is about 262.7547000294.

The spelling of 18140593 in words is "eighteen million, one hundred forty thousand, five hundred ninety-three".