18828977 has 2 divisors, whose sum is σ = 18828978. Its totient is φ = 18828976.

The previous prime is 18828947. The next prime is 18828983. The reversal of 18828977 is 77982881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14167696 + 4661281 = 3764^2 + 2159^2 .

It is an emirp because it is prime and its reverse (77982881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18828977 - 2⁸ = 18828721 is a prime.

It is not a weakly prime, because it can be changed into another prime (18828907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9414488 + 9414489.

It is an arithmetic number, because the mean of its divisors is an integer number (9414489).

Almost surely, 2^18828977 is an apocalyptic number.

It is an amenable number.

18828977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18828977 is an equidigital number, since it uses as much as digits as its factorization.

18828977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 50.

The square root of 18828977 is about 4339.2369144816. The cubic root of 18828977 is about 266.0371224125.

The spelling of 18828977 in words is "eighteen million, eight hundred twenty-eight thousand, nine hundred seventy-seven".