18290873 has 2 divisors, whose sum is σ = 18290874. Its totient is φ = 18290872.

The previous prime is 18290869. The next prime is 18290891. The reversal of 18290873 is 37809281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10156969 + 8133904 = 3187^2 + 2852^2 .

It is an emirp because it is prime and its reverse (37809281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18290873 - 2² = 18290869 is a prime.

It is not a weakly prime, because it can be changed into another prime (18290893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145436 + 9145437.

It is an arithmetic number, because the mean of its divisors is an integer number (9145437).

Almost surely, 2^18290873 is an apocalyptic number.

It is an amenable number.

18290873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18290873 is an equidigital number, since it uses as much as digits as its factorization.

18290873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18290873 is about 4276.7830199813. The cubic root of 18290873 is about 263.4782749943.

The spelling of 18290873 in words is "eighteen million, two hundred ninety thousand, eight hundred seventy-three".