18983994 has 16 divisors (see below), whose sum is σ = 38024640. Its totient is φ = 6318560.

The previous prime is 18983989. The next prime is 18983999. The reversal of 18983994 is 49938981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18983989) and next prime (18983999).

It is not an unprimeable number, because it can be changed into a prime (18983999) 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 7 ways as a sum of consecutive naturals, for example, 2899 + ... + 6809.

It is an arithmetic number, because the mean of its divisors is an integer number (2376540).

Almost surely, 2^18983994 is an apocalyptic number.

18983994 is an abundant number, since it is smaller than the sum of its proper divisors (19040646).

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

18983994 is a wasteful number, since it uses less digits than its factorization.

18983994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725.

The product of its digits is 559872, while the sum is 51.

The square root of 18983994 is about 4357.0625425853. The cubic root of 18983994 is about 266.7652132304.

The spelling of 18983994 in words is "eighteen million, nine hundred eighty-three thousand, nine hundred ninety-four".