18120533 has 4 divisors (see below), whose sum is σ = 18163008. Its totient is φ = 18078060.

The previous prime is 18120517. The next prime is 18120559. The reversal of 18120533 is 33502181.

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.

It is a cyclic number.

It is not a de Polignac number, because 18120533 - 2⁴ = 18120517 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 18120499 and 18120508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120503) 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, 20591 + ... + 21452.

It is an arithmetic number, because the mean of its divisors is an integer number (4540752).

Almost surely, 2^18120533 is an apocalyptic number.

It is an amenable number.

18120533 is a deficient number, since it is larger than the sum of its proper divisors (42475).

18120533 is an equidigital number, since it uses as much as digits as its factorization.

18120533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42474.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 18120533 is about 4256.8219366095. The cubic root of 18120533 is about 262.6578122865.

The spelling of 18120533 in words is "eighteen million, one hundred twenty thousand, five hundred thirty-three".