18642899 has 4 divisors (see below), whose sum is σ = 20337720. Its totient is φ = 16948080.

The previous prime is 18642893. The next prime is 18642941. The reversal of 18642899 is 99824681.

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 18642899 - 2¹² = 18638803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18642893) 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, 847394 + ... + 847415.

It is an arithmetic number, because the mean of its divisors is an integer number (5084430).

Almost surely, 2^18642899 is an apocalyptic number.

18642899 is a deficient number, since it is larger than the sum of its proper divisors (1694821).

18642899 is a wasteful number, since it uses less digits than its factorization.

18642899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694820.

The product of its digits is 248832, while the sum is 47.

The square root of 18642899 is about 4317.7423498861. The cubic root of 18642899 is about 265.1578459161.

The spelling of 18642899 in words is "eighteen million, six hundred forty-two thousand, eight hundred ninety-nine".