18378077 has 2 divisors, whose sum is σ = 18378078. Its totient is φ = 18378076.

The previous prime is 18378067. The next prime is 18378079. The reversal of 18378077 is 77087381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 8281 = 4286^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 18378077 - 2⁶ = 18378013 is a prime.

Together with 18378079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18378079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189038 + 9189039.

It is an arithmetic number, because the mean of its divisors is an integer number (9189039).

Almost surely, 2^18378077 is an apocalyptic number.

It is an amenable number.

18378077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378077 is an equidigital number, since it uses as much as digits as its factorization.

18378077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 18378077 is about 4286.9659434150. The cubic root of 18378077 is about 263.8963330733.

The spelling of 18378077 in words is "eighteen million, three hundred seventy-eight thousand, seventy-seven".