18328899 has 16 divisors (see below), whose sum is σ = 25391520. Its totient is φ = 11746560.

The previous prime is 18328897. The next prime is 18328903. The reversal of 18328899 is 99882381.

It is a happy number.

It is not a de Polignac number, because 18328899 - 2¹ = 18328897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18328897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39529 + ... + 39989.

It is an arithmetic number, because the mean of its divisors is an integer number (1586970).

Almost surely, 2^18328899 is an apocalyptic number.

18328899 is a deficient number, since it is larger than the sum of its proper divisors (7062621).

18328899 is a wasteful number, since it uses less digits than its factorization.

18328899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950.

The product of its digits is 248832, while the sum is 48.

The square root of 18328899 is about 4281.2263430003. The cubic root of 18328899 is about 263.6607355734.

It can be divided in two parts, 1832 and 8899, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 18328899 in words is "eighteen million, three hundred twenty-eight thousand, eight hundred ninety-nine".