18366368 has 36 divisors (see below), whose sum is σ = 37134342. Its totient is φ = 8939520.

The previous prime is 18366347. The next prime is 18366371. The reversal of 18366368 is 86366381.

It can be written as a sum of positive squares in 3 ways, for example, as 9909904 + 8456464 = 3148^2 + 2908^2 .

It is a super-2 number, since 2×18366368² = 674646947022848, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 189296 + ... + 189392.

Almost surely, 2^18366368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18366368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18567171).

18366368 is an abundant number, since it is smaller than the sum of its proper divisors (18767974).

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

18366368 is an frugal number, since it uses more digits than its factorization.

18366368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 160 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 18366368 is about 4285.6000746687. The cubic root of 18366368 is about 263.8402768163.

It can be divided in two parts, 18 and 366368, that multiplied together give a square (6594624 = 2568²).

The spelling of 18366368 in words is "eighteen million, three hundred sixty-six thousand, three hundred sixty-eight".