18073813 has 2 divisors, whose sum is σ = 18073814. Its totient is φ = 18073812.

The previous prime is 18073799. The next prime is 18073819. The reversal of 18073813 is 31837081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15311569 + 2762244 = 3913^2 + 1662^2 .

It is a cyclic number.

It is not a de Polignac number, because 18073813 - 2²¹ = 15976661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18073819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9036906 + 9036907.

It is an arithmetic number, because the mean of its divisors is an integer number (9036907).

Almost surely, 2^18073813 is an apocalyptic number.

It is an amenable number.

18073813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18073813 is an equidigital number, since it uses as much as digits as its factorization.

18073813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18073813 is about 4251.3307328412. The cubic root of 18073813 is about 262.4318819471.

The spelling of 18073813 in words is "eighteen million, seventy-three thousand, eight hundred thirteen".