18340573 has 2 divisors, whose sum is σ = 18340574. Its totient is φ = 18340572.

The previous prime is 18340547. The next prime is 18340613. The reversal of 18340573 is 37504381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17081689 + 1258884 = 4133^2 + 1122^2 .

It is a cyclic number.

It is not a de Polignac number, because 18340573 - 2⁹ = 18340061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18340523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9170286 + 9170287.

It is an arithmetic number, because the mean of its divisors is an integer number (9170287).

Almost surely, 2^18340573 is an apocalyptic number.

It is an amenable number.

18340573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18340573 is an equidigital number, since it uses as much as digits as its factorization.

18340573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 18340573 is about 4282.5895203720. The cubic root of 18340573 is about 263.7167004222.

It can be divided in two parts, 18340 and 573, that multiplied together give a triangular number (10508820 = T₄₅₈₄).

The spelling of 18340573 in words is "eighteen million, three hundred forty thousand, five hundred seventy-three".