18495253 has 4 divisors (see below), whose sum is σ = 21137440. Its totient is φ = 15853068.

The previous prime is 18495233. The next prime is 18495263. The reversal of 18495253 is 35259481.

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: 35259481 = 409 ⋅86209.

It is not a de Polignac number, because 18495253 - 2⁹ = 18494741 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 (18495233) 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, 1321083 + ... + 1321096.

It is an arithmetic number, because the mean of its divisors is an integer number (5284360).

Almost surely, 2^18495253 is an apocalyptic number.

It is an amenable number.

18495253 is a deficient number, since it is larger than the sum of its proper divisors (2642187).

18495253 is an equidigital number, since it uses as much as digits as its factorization.

18495253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642186.

The product of its digits is 43200, while the sum is 37.

The square root of 18495253 is about 4300.6107705767. The cubic root of 18495253 is about 264.4560004379.

The spelling of 18495253 in words is "eighteen million, four hundred ninety-five thousand, two hundred fifty-three".