18123773 has 2 divisors, whose sum is σ = 18123774. Its totient is φ = 18123772.

The previous prime is 18123761. The next prime is 18123779. The reversal of 18123773 is 37732181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 6543364 = 3403^2 + 2558^2 .

It is an emirp because it is prime and its reverse (37732181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18123773 - 2⁶ = 18123709 is a prime.

It is a super-2 number, since 2×18123773² = 656942295511058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18123779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061886 + 9061887.

It is an arithmetic number, because the mean of its divisors is an integer number (9061887).

Almost surely, 2^18123773 is an apocalyptic number.

It is an amenable number.

18123773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123773 is an equidigital number, since it uses as much as digits as its factorization.

18123773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 18123773 is about 4257.2024852008. The cubic root of 18123773 is about 262.6734659945.

The spelling of 18123773 in words is "eighteen million, one hundred twenty-three thousand, seven hundred seventy-three".