18186349 has 8 divisors (see below), whose sum is σ = 18490680. Its totient is φ = 17884416.

The previous prime is 18186341. The next prime is 18186359. The reversal of 18186349 is 94368181.

It can be written as a sum of positive squares in 4 ways, for example, as 1170724 + 17015625 = 1082^2 + 4125^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18186349 - 2³ = 18186341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18186341) 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, 20299 + ... + 21175.

It is an arithmetic number, because the mean of its divisors is an integer number (2311335).

Almost surely, 2^18186349 is an apocalyptic number.

It is an amenable number.

18186349 is a deficient number, since it is larger than the sum of its proper divisors (304331).

18186349 is an equidigital number, since it uses as much as digits as its factorization.

18186349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199.

The product of its digits is 41472, while the sum is 40.

The square root of 18186349 is about 4264.5455795430. The cubic root of 18186349 is about 262.9754298588.

The spelling of 18186349 in words is "eighteen million, one hundred eighty-six thousand, three hundred forty-nine".