18361338 has 16 divisors (see below), whose sum is σ = 37188480. Its totient is φ = 6042816.

The previous prime is 18361333. The next prime is 18361339. The reversal of 18361338 is 83316381.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18361299 and 18361308.

It is not an unprimeable number, because it can be changed into a prime (18361333) 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 7 ways as a sum of consecutive naturals, for example, 18895 + ... + 19842.

It is an arithmetic number, because the mean of its divisors is an integer number (2324280).

Almost surely, 2^18361338 is an apocalyptic number.

18361338 is an abundant number, since it is smaller than the sum of its proper divisors (18827142).

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

18361338 is a wasteful number, since it uses less digits than its factorization.

18361338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38821.

The product of its digits is 10368, while the sum is 33.

The square root of 18361338 is about 4285.0131855106. The cubic root of 18361338 is about 263.8161886249.

The spelling of 18361338 in words is "eighteen million, three hundred sixty-one thousand, three hundred thirty-eight".