18999996 has 24 divisors (see below), whose sum is σ = 44413824. Its totient is φ = 6321840.

The previous prime is 18999991. The next prime is 18999997. The reversal of 18999996 is 69999981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999991) 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 7 ways as a sum of consecutive naturals, for example, 7851 + ... + 9981.

It is an arithmetic number, because the mean of its divisors is an integer number (1850576).

Almost surely, 2^18999996 is an apocalyptic number.

It is an amenable number.

18999996 is an abundant number, since it is smaller than the sum of its proper divisors (25413828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18999996 is a wasteful number, since it uses less digits than its factorization.

18999996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881 (or 2879 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 60.

The square root of 18999996 is about 4358.8984847092. The cubic root of 18999996 is about 266.8401461466.

The spelling of 18999996 in words is "eighteen million, nine hundred ninety-nine thousand, nine hundred ninety-six".