18313873 has 2 divisors, whose sum is σ = 18313874. Its totient is φ = 18313872.

The previous prime is 18313871. The next prime is 18313903. The reversal of 18313873 is 37831381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14265729 + 4048144 = 3777^2 + 2012^2 .

It is a cyclic number.

It is not a de Polignac number, because 18313873 - 2¹ = 18313871 is a prime.

Together with 18313871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18313871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156936 + 9156937.

It is an arithmetic number, because the mean of its divisors is an integer number (9156937).

Almost surely, 2^18313873 is an apocalyptic number.

It is an amenable number.

18313873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18313873 is an equidigital number, since it uses as much as digits as its factorization.

18313873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 18313873 is about 4279.4711121820. The cubic root of 18313873 is about 263.5886663360.

The spelling of 18313873 in words is "eighteen million, three hundred thirteen thousand, eight hundred seventy-three".