18943384 has 8 divisors (see below), whose sum is σ = 35518860. Its totient is φ = 9471688.

The previous prime is 18943381. The next prime is 18943417. The reversal of 18943384 is 48334981.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1183954 + ... + 1183969.

Almost surely, 2^18943384 is an apocalyptic number.

It is an amenable number.

18943384 is a deficient number, since it is larger than the sum of its proper divisors (16575476).

18943384 is a wasteful number, since it uses less digits than its factorization.

18943384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367929 (or 2367925 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 18943384 is about 4352.3997978127. The cubic root of 18943384 is about 266.5748586738.

The spelling of 18943384 in words is "eighteen million, nine hundred forty-three thousand, three hundred eighty-four".