18140513 has 6 divisors (see below), whose sum is σ = 19226214. Its totient is φ = 17056896.

The previous prime is 18140503. The next prime is 18140519. The reversal of 18140513 is 31504181.

It can be written as a sum of positive squares in 3 ways, for example, as 14961424 + 3179089 = 3868^2 + 1783^2 .

It is not a de Polignac number, because 18140513 - 2¹⁸ = 17878369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18140519) 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 5 ways as a sum of consecutive naturals, for example, 17045 + ... + 18077.

It is an arithmetic number, because the mean of its divisors is an integer number (3204369).

Almost surely, 2^18140513 is an apocalyptic number.

It is an amenable number.

18140513 is a deficient number, since it is larger than the sum of its proper divisors (1085701).

18140513 is an frugal number, since it uses more digits than its factorization.

18140513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083 (or 1050 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18140513 is about 4259.1681112630. The cubic root of 18140513 is about 262.7543137795.

Adding to 18140513 its reverse (31504181), we get a palindrome (49644694).

The spelling of 18140513 in words is "eighteen million, one hundred forty thousand, five hundred thirteen".