18887699 has 2 divisors, whose sum is σ = 18887700. Its totient is φ = 18887698.

The previous prime is 18887689. The next prime is 18887741. The reversal of 18887699 is 99678881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (99678881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18887699 - 2⁴ = 18887683 is a prime.

It is not a weakly prime, because it can be changed into another prime (18887639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9443849 + 9443850.

It is an arithmetic number, because the mean of its divisors is an integer number (9443850).

Almost surely, 2^18887699 is an apocalyptic number.

18887699 is a deficient number, since it is larger than the sum of its proper divisors (1).

18887699 is an equidigital number, since it uses as much as digits as its factorization.

18887699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 56.

The square root of 18887699 is about 4345.9980441781. The cubic root of 18887699 is about 266.3133990544.

The spelling of 18887699 in words is "eighteen million, eight hundred eighty-seven thousand, six hundred ninety-nine".