18140777 has 2 divisors, whose sum is σ = 18140778. Its totient is φ = 18140776.

The previous prime is 18140753. The next prime is 18140779. The reversal of 18140777 is 77704181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17606416 + 534361 = 4196^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 18140777 - 2¹⁸ = 17878633 is a prime.

Together with 18140779, 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 (18140779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070388 + 9070389.

It is an arithmetic number, because the mean of its divisors is an integer number (9070389).

Almost surely, 2^18140777 is an apocalyptic number.

It is an amenable number.

18140777 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140777 is an equidigital number, since it uses as much as digits as its factorization.

18140777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 18140777 is about 4259.1991031179. The cubic root of 18140777 is about 262.7555883998.

The spelling of 18140777 in words is "eighteen million, one hundred forty thousand, seven hundred seventy-seven".