18140413 has 2 divisors, whose sum is σ = 18140414. Its totient is φ = 18140412.

The previous prime is 18140401. The next prime is 18140431. The reversal of 18140413 is 31404181.

Together with next prime (18140431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15697444 + 2442969 = 3962^2 + 1563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18140413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18140113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070206 + 9070207.

It is an arithmetic number, because the mean of its divisors is an integer number (9070207).

Almost surely, 2^18140413 is an apocalyptic number.

It is an amenable number.

18140413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140413 is an equidigital number, since it uses as much as digits as its factorization.

18140413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18140413 is about 4259.1563718652. The cubic root of 18140413 is about 262.7538309655.

Adding to 18140413 its reverse (31404181), we get a palindrome (49544594).

The spelling of 18140413 in words is "eighteen million, one hundred forty thousand, four hundred thirteen".