18185396 has 6 divisors (see below), whose sum is σ = 31824450. Its totient is φ = 9092696.

The previous prime is 18185357. The next prime is 18185423. The reversal of 18185396 is 69358181.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 376996 = 4220^2 + 614^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2273171 + ... + 2273178.

It is an arithmetic number, because the mean of its divisors is an integer number (5304075).

Almost surely, 2^18185396 is an apocalyptic number.

It is an amenable number.

18185396 is a deficient number, since it is larger than the sum of its proper divisors (13639054).

18185396 is a wasteful number, since it uses less digits than its factorization.

18185396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546353 (or 4546351 counting only the distinct ones).

The product of its digits is 51840, while the sum is 41.

The square root of 18185396 is about 4264.4338428448. The cubic root of 18185396 is about 262.9708363041.

It can be divided in two parts, 18185 and 396, that added together give a palindrome (18581).

The spelling of 18185396 in words is "eighteen million, one hundred eighty-five thousand, three hundred ninety-six".