18423413 has 4 divisors (see below), whose sum is σ = 18493728. Its totient is φ = 18353100.

The previous prime is 18423341. The next prime is 18423421. The reversal of 18423413 is 31432481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18423413 - 2⁸ = 18423157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18423313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34763 + ... + 35288.

It is an arithmetic number, because the mean of its divisors is an integer number (4623432).

Almost surely, 2^18423413 is an apocalyptic number.

It is an amenable number.

18423413 is a deficient number, since it is larger than the sum of its proper divisors (70315).

18423413 is an equidigital number, since it uses as much as digits as its factorization.

18423413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70314.

The product of its digits is 2304, while the sum is 26.

The square root of 18423413 is about 4292.2503421865. The cubic root of 18423413 is about 264.1131526351.

Adding to 18423413 its reverse (31432481), we get a palindrome (49855894).

The spelling of 18423413 in words is "eighteen million, four hundred twenty-three thousand, four hundred thirteen".