18385253 has 4 divisors (see below), whose sum is σ = 18399948. Its totient is φ = 18370560.

The previous prime is 18385249. The next prime is 18385271. The reversal of 18385253 is 35258381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35258381 = 311 ⋅113371.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 10975969 = 2722^2 + 3313^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385253 - 2² = 18385249 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 (18385243) 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, 5276 + ... + 8037.

It is an arithmetic number, because the mean of its divisors is an integer number (4599987).

Almost surely, 2^18385253 is an apocalyptic number.

It is an amenable number.

18385253 is a deficient number, since it is larger than the sum of its proper divisors (14695).

18385253 is a wasteful number, since it uses less digits than its factorization.

18385253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14694.

The product of its digits is 28800, while the sum is 35.

The square root of 18385253 is about 4287.8028172947. The cubic root of 18385253 is about 263.9306760509.

The spelling of 18385253 in words is "eighteen million, three hundred eighty-five thousand, two hundred fifty-three".