18021453 has 4 divisors (see below), whose sum is σ = 24028608. Its totient is φ = 12014300.

The previous prime is 18021449. The next prime is 18021457. The reversal of 18021453 is 35412081.

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 an interprime number because it is at equal distance from previous prime (18021449) and next prime (18021457).

It is a cyclic number.

It is not a de Polignac number, because 18021453 - 2² = 18021449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021457) 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, 3003573 + ... + 3003578.

It is an arithmetic number, because the mean of its divisors is an integer number (6007152).

Almost surely, 2^18021453 is an apocalyptic number.

It is an amenable number.

18021453 is a deficient number, since it is larger than the sum of its proper divisors (6007155).

18021453 is an equidigital number, since it uses as much as digits as its factorization.

18021453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007154.

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

The square root of 18021453 is about 4245.1681945478. The cubic root of 18021453 is about 262.1782143169.

The spelling of 18021453 in words is "eighteen million, twenty-one thousand, four hundred fifty-three".