18994365 has 64 divisors (see below), whose sum is σ = 37094400. Its totient is φ = 9165312.

The previous prime is 18994361. The next prime is 18994373. The reversal of 18994365 is 56349981.

It is a happy number.

It is not a de Polignac number, because 18994365 - 2² = 18994361 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (233280) is a multiple of the sum of its prime factors (243).

It is a self number, because there is not a number n which added to its sum of digits gives 18994365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994361) 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 63 ways as a sum of consecutive naturals, for example, 138577 + ... + 138713.

It is an arithmetic number, because the mean of its divisors is an integer number (579600).

Almost surely, 2^18994365 is an apocalyptic number.

18994365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18994365 is a deficient number, since it is larger than the sum of its proper divisors (18100035).

18994365 is a wasteful number, since it uses less digits than its factorization.

18994365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 18994365 is about 4358.2525167778. The cubic root of 18994365 is about 266.8137825388.

The spelling of 18994365 in words is "eighteen million, nine hundred ninety-four thousand, three hundred sixty-five".