18413 has 2 divisors, whose sum is σ = 18414. Its totient is φ = 18412.

The previous prime is 18401. The next prime is 18427. The reversal of 18413 is 31481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13924 + 4489 = 118^2 + 67^2 .

It is an emirp because it is prime and its reverse (31481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18413 - 2⁴ = 18397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18391 and 18400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9206 + 9207.

It is an arithmetic number, because the mean of its divisors is an integer number (9207).

2¹⁸⁴¹³ is an apocalyptic number.

It is an amenable number.

18413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18413 is an equidigital number, since it uses as much as digits as its factorization.

18413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 18413 is about 135.6945098374. The cubic root of 18413 is about 26.4063383924.

Adding to 18413 its reverse (31481), we get a palindrome (49894).

The spelling of 18413 in words is "eighteen thousand, four hundred thirteen".