18505349 has 4 divisors (see below), whose sum is σ = 18514860. Its totient is φ = 18495840.

The previous prime is 18505307. The next prime is 18505381. The reversal of 18505349 is 94350581.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13912900 + 4592449 = 3730^2 + 2143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18505349 is a prime.

It is a super-2 number, since 2×18505349² = 684895883223602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18505049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662 + ... + 6119.

It is an arithmetic number, because the mean of its divisors is an integer number (4628715).

Almost surely, 2^18505349 is an apocalyptic number.

It is an amenable number.

18505349 is a deficient number, since it is larger than the sum of its proper divisors (9511).

18505349 is an equidigital number, since it uses as much as digits as its factorization.

18505349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 18505349 is about 4301.7843972008. The cubic root of 18505349 is about 264.5041111993.

The spelling of 18505349 in words is "eighteen million, five hundred five thousand, three hundred forty-nine".