18384442 has 8 divisors (see below), whose sum is σ = 27640800. Its totient is φ = 9170844.

The previous prime is 18384439. The next prime is 18384451. The reversal of 18384442 is 24448381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18384398 and 18384407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9592 + ... + 11347.

It is an arithmetic number, because the mean of its divisors is an integer number (3455100).

Almost surely, 2^18384442 is an apocalyptic number.

18384442 is a deficient number, since it is larger than the sum of its proper divisors (9256358).

18384442 is a wasteful number, since it uses less digits than its factorization.

18384442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380.

The product of its digits is 24576, while the sum is 34.

The square root of 18384442 is about 4287.7082456716. The cubic root of 18384442 is about 263.9267952064.

The spelling of 18384442 in words is "eighteen million, three hundred eighty-four thousand, four hundred forty-two".