18077879 has 2 divisors, whose sum is σ = 18077880. Its totient is φ = 18077878.

The previous prime is 18077863. The next prime is 18077881. The reversal of 18077879 is 97877081.

It is a strong prime.

It is an emirp because it is prime and its reverse (97877081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18077879 - 2⁴ = 18077863 is a prime.

It is a Sophie Germain prime.

Together with 18077881, 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 (18077819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9038939 + 9038940.

It is an arithmetic number, because the mean of its divisors is an integer number (9038940).

Almost surely, 2^18077879 is an apocalyptic number.

18077879 is a deficient number, since it is larger than the sum of its proper divisors (1).

18077879 is an equidigital number, since it uses as much as digits as its factorization.

18077879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 18077879 is about 4251.8089091585. The cubic root of 18077879 is about 262.4515599204.

The spelling of 18077879 in words is "eighteen million, seventy-seven thousand, eight hundred seventy-nine".