18828787 has 2 divisors, whose sum is σ = 18828788. Its totient is φ = 18828786.

The previous prime is 18828773. The next prime is 18828827. The reversal of 18828787 is 78782881.

It is a weak prime.

It is an emirp because it is prime and its reverse (78782881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18828787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18828787.

It is not a weakly prime, because it can be changed into another prime (18828737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9414393 + 9414394.

It is an arithmetic number, because the mean of its divisors is an integer number (9414394).

Almost surely, 2^18828787 is an apocalyptic number.

18828787 is a deficient number, since it is larger than the sum of its proper divisors (1).

18828787 is an equidigital number, since it uses as much as digits as its factorization.

18828787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 401408, while the sum is 49.

The square root of 18828787 is about 4339.2150211761. The cubic root of 18828787 is about 266.0362275643.

The spelling of 18828787 in words is "eighteen million, eight hundred twenty-eight thousand, seven hundred eighty-seven".