18140594 has 4 divisors (see below), whose sum is σ = 27210894. Its totient is φ = 9070296.

The previous prime is 18140587. The next prime is 18140597. The reversal of 18140594 is 49504181.

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

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 2640625 = 3937^2 + 1625^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18140594.

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 as a sum of consecutive naturals, namely, 4535147 + ... + 4535150.

Almost surely, 2^18140594 is an apocalyptic number.

18140594 is a deficient number, since it is larger than the sum of its proper divisors (9070300).

18140594 is an equidigital number, since it uses as much as digits as its factorization.

18140594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9070299.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18140594 is about 4259.1776201516. The cubic root of 18140594 is about 262.7547048575.

The spelling of 18140594 in words is "eighteen million, one hundred forty thousand, five hundred ninety-four".