18740999 has 2 divisors, whose sum is σ = 18741000. Its totient is φ = 18740998.

The previous prime is 18740993. The next prime is 18741001. The reversal of 18740999 is 99904781.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18740999 is a prime.

Together with 18741001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18740993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9370499 + 9370500.

It is an arithmetic number, because the mean of its divisors is an integer number (9370500).

Almost surely, 2^18740999 is an apocalyptic number.

18740999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18740999 is an equidigital number, since it uses as much as digits as its factorization.

18740999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 18740999 is about 4329.0875482023. The cubic root of 18740999 is about 265.6221244256.

The spelling of 18740999 in words is "eighteen million, seven hundred forty thousand, nine hundred ninety-nine".