18816377 has 2 divisors, whose sum is σ = 18816378. Its totient is φ = 18816376.

The previous prime is 18816367. The next prime is 18816379. The reversal of 18816377 is 77361881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17673616 + 1142761 = 4204^2 + 1069^2 .

It is an emirp because it is prime and its reverse (77361881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18816377 - 2⁴ = 18816361 is a prime.

It is a super-2 number, since 2×18816377² = 708112086812258, which contains 22 as substring.

Together with 18816379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18816379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9408188 + 9408189.

It is an arithmetic number, because the mean of its divisors is an integer number (9408189).

Almost surely, 2^18816377 is an apocalyptic number.

It is an amenable number.

18816377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18816377 is an equidigital number, since it uses as much as digits as its factorization.

18816377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 18816377 is about 4337.7848033299. The cubic root of 18816377 is about 265.9777668115.

The spelling of 18816377 in words is "eighteen million, eight hundred sixteen thousand, three hundred seventy-seven".