18865338 has 16 divisors (see below), whose sum is σ = 38750880. Its totient is φ = 6118416.

The previous prime is 18865331. The next prime is 18865351. The reversal of 18865338 is 83356881.

It is a self number, because there is not a number n which added to its sum of digits gives 18865338.

It is not an unprimeable number, because it can be changed into a prime (18865331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42268 + ... + 42711.

It is an arithmetic number, because the mean of its divisors is an integer number (2421930).

Almost surely, 2^18865338 is an apocalyptic number.

18865338 is an abundant number, since it is smaller than the sum of its proper divisors (19885542).

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

18865338 is a wasteful number, since it uses less digits than its factorization.

18865338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85021.

The product of its digits is 138240, while the sum is 42.

The square root of 18865338 is about 4343.4246856599. The cubic root of 18865338 is about 266.2082620990.

The spelling of 18865338 in words is "eighteen million, eight hundred sixty-five thousand, three hundred thirty-eight".