18963899 has 2 divisors, whose sum is σ = 18963900. Its totient is φ = 18963898.

The previous prime is 18963859. The next prime is 18963907. The reversal of 18963899 is 99836981.

It is a strong prime.

It is an emirp because it is prime and its reverse (99836981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18963899 - 2⁸ = 18963643 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18963899.

It is not a weakly prime, because it can be changed into another prime (18963809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9481949 + 9481950.

It is an arithmetic number, because the mean of its divisors is an integer number (9481950).

Almost surely, 2^18963899 is an apocalyptic number.

18963899 is a deficient number, since it is larger than the sum of its proper divisors (1).

18963899 is an equidigital number, since it uses as much as digits as its factorization.

18963899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 53.

The square root of 18963899 is about 4354.7559059033. The cubic root of 18963899 is about 266.6710542681.

The spelling of 18963899 in words is "eighteen million, nine hundred sixty-three thousand, eight hundred ninety-nine".