18942499 has 2 divisors, whose sum is σ = 18942500. Its totient is φ = 18942498.

The previous prime is 18942479. The next prime is 18942523. The reversal of 18942499 is 99424981.

It is a weak prime.

It is an emirp because it is prime and its reverse (99424981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18942499 is a prime.

It is not a weakly prime, because it can be changed into another prime (18942419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471249 + 9471250.

It is an arithmetic number, because the mean of its divisors is an integer number (9471250).

Almost surely, 2^18942499 is an apocalyptic number.

18942499 is a deficient number, since it is larger than the sum of its proper divisors (1).

18942499 is an equidigital number, since it uses as much as digits as its factorization.

18942499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 18942499 is about 4352.2981285753. The cubic root of 18942499 is about 266.5707073137.

The spelling of 18942499 in words is "eighteen million, nine hundred forty-two thousand, four hundred ninety-nine".