18933945 has 16 divisors (see below), whose sum is σ = 31612032. Its totient is φ = 9658880.

The previous prime is 18933883. The next prime is 18933947. The reversal of 18933945 is 54933981.

It is not a de Polignac number, because 18933945 - 2⁸ = 18933689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18933897 and 18933906.

It is not an unprimeable number, because it can be changed into a prime (18933947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27096 + ... + 27785.

It is an arithmetic number, because the mean of its divisors is an integer number (1975752).

Almost surely, 2^18933945 is an apocalyptic number.

18933945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18933945 is a deficient number, since it is larger than the sum of its proper divisors (12678087).

18933945 is a wasteful number, since it uses less digits than its factorization.

18933945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54912.

The product of its digits is 116640, while the sum is 42.

The square root of 18933945 is about 4351.3153183836. The cubic root of 18933945 is about 266.5305755241.

The spelling of 18933945 in words is "eighteen million, nine hundred thirty-three thousand, nine hundred forty-five".