19990499 has 2 divisors, whose sum is σ = 19990500. Its totient is φ = 19990498.

The previous prime is 19990459. The next prime is 19990501. The reversal of 19990499 is 99409991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19990499 - 2²⁴ = 3213283 is a prime.

It is a Sophie Germain prime.

Together with 19990501, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19990409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9995249 + 9995250.

It is an arithmetic number, because the mean of its divisors is an integer number (9995250).

Almost surely, 2^19990499 is an apocalyptic number.

19990499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19990499 is an equidigital number, since it uses as much as digits as its factorization.

19990499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 19990499 is about 4471.0735847221. The cubic root of 19990499 is about 271.3987720484.

The spelling of 19990499 in words is "nineteen million, nine hundred ninety thousand, four hundred ninety-nine".