18948899 has 4 divisors (see below), whose sum is σ = 18958536. Its totient is φ = 18939264.

The previous prime is 18948893. The next prime is 18948907. The reversal of 18948899 is 99884981.

18948899 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18948899 - 2⁴ = 18948883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18948893) 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, 689 + ... + 6194.

It is an arithmetic number, because the mean of its divisors is an integer number (4739634).

Almost surely, 2^18948899 is an apocalyptic number.

18948899 is a deficient number, since it is larger than the sum of its proper divisors (9637).

18948899 is an equidigital number, since it uses as much as digits as its factorization.

18948899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9636.

The product of its digits is 1492992, while the sum is 56.

The square root of 18948899 is about 4353.0333102332. The cubic root of 18948899 is about 266.6007255357.

The spelling of 18948899 in words is "eighteen million, nine hundred forty-eight thousand, eight hundred ninety-nine".