18434513 has 4 divisors (see below), whose sum is σ = 18782388. Its totient is φ = 18086640.

The previous prime is 18434509. The next prime is 18434527. The reversal of 18434513 is 31543481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16507969 + 1926544 = 4063^2 + 1388^2 .

It is a cyclic number.

It is not a de Polignac number, because 18434513 - 2² = 18434509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18434113) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 173858 + ... + 173963.

It is an arithmetic number, because the mean of its divisors is an integer number (4695597).

Almost surely, 2^18434513 is an apocalyptic number.

It is an amenable number.

18434513 is a deficient number, since it is larger than the sum of its proper divisors (347875).

18434513 is an equidigital number, since it uses as much as digits as its factorization.

18434513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347874.

The product of its digits is 5760, while the sum is 29.

The square root of 18434513 is about 4293.5431755137. The cubic root of 18434513 is about 264.1661842028.

Adding to 18434513 its reverse (31543481), we get a palindrome (49977994).

The spelling of 18434513 in words is "eighteen million, four hundred thirty-four thousand, five hundred thirteen".