18140259 has 4 divisors (see below), whose sum is σ = 24187016. Its totient is φ = 12093504.

The previous prime is 18140219. The next prime is 18140267. The reversal of 18140259 is 95204181.

It is a happy number.

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

It is not a de Polignac number, because 18140259 - 2⁷ = 18140131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18140219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3023374 + ... + 3023379.

It is an arithmetic number, because the mean of its divisors is an integer number (6046754).

Almost surely, 2^18140259 is an apocalyptic number.

18140259 is a deficient number, since it is larger than the sum of its proper divisors (6046757).

18140259 is an equidigital number, since it uses as much as digits as its factorization.

18140259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6046756.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 18140259 is about 4259.1382931293. The cubic root of 18140259 is about 262.7530874285.

The spelling of 18140259 in words is "eighteen million, one hundred forty thousand, two hundred fifty-nine".