18140253 has 4 divisors (see below), whose sum is σ = 24187008. Its totient is φ = 12093500.

The previous prime is 18140219. The next prime is 18140267. The reversal of 18140253 is 35204181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35204181 = 3 ⋅11734727.

It is a cyclic number.

It is not a de Polignac number, because 18140253 - 2⁶ = 18140189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140203) 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, 3023373 + ... + 3023378.

It is an arithmetic number, because the mean of its divisors is an integer number (6046752).

Almost surely, 2^18140253 is an apocalyptic number.

It is an amenable number.

18140253 is a deficient number, since it is larger than the sum of its proper divisors (6046755).

18140253 is an equidigital number, since it uses as much as digits as its factorization.

18140253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046754.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18140253 is about 4259.1375887614. The cubic root of 18140253 is about 262.7530584594.

The spelling of 18140253 in words is "eighteen million, one hundred forty thousand, two hundred fifty-three".