18072253 has 4 divisors (see below), whose sum is σ = 18080860. Its totient is φ = 18063648.

The previous prime is 18072247. The next prime is 18072259. The reversal of 18072253 is 35227081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 35227081 = 1289 ⋅27329.

It is an interprime number because it is at equal distance from previous prime (18072247) and next prime (18072259).

It can be written as a sum of positive squares in 2 ways, for example, as 1734489 + 16337764 = 1317^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 18072253 - 2⁹ = 18071741 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 (18072259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1153 + ... + 6121.

It is an arithmetic number, because the mean of its divisors is an integer number (4520215).

Almost surely, 2^18072253 is an apocalyptic number.

It is an amenable number.

18072253 is a deficient number, since it is larger than the sum of its proper divisors (8607).

18072253 is an equidigital number, since it uses as much as digits as its factorization.

18072253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8606.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 18072253 is about 4251.1472569178. The cubic root of 18072253 is about 262.4243313265.

The spelling of 18072253 in words is "eighteen million, seventy-two thousand, two hundred fifty-three".