18819799 has 4 divisors (see below), whose sum is σ = 19926864. Its totient is φ = 17712736.

The previous prime is 18819797. The next prime is 18819809. The reversal of 18819799 is 99791881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18819799 - 2¹ = 18819797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18819793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553507 + ... + 553540.

It is an arithmetic number, because the mean of its divisors is an integer number (4981716).

Almost surely, 2^18819799 is an apocalyptic number.

18819799 is a deficient number, since it is larger than the sum of its proper divisors (1107065).

18819799 is a wasteful number, since it uses less digits than its factorization.

18819799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107064.

The product of its digits is 326592, while the sum is 52.

The square root of 18819799 is about 4338.1792263575. The cubic root of 18819799 is about 265.9938896593.

The spelling of 18819799 in words is "eighteen million, eight hundred nineteen thousand, seven hundred ninety-nine".