18357813 has 8 divisors (see below), whose sum is σ = 27196800. Its totient is φ = 12238524.

The previous prime is 18357751. The next prime is 18357827. The reversal of 18357813 is 31875381.

18357813 is a `hidden beast` number, since 1 + 83 + 578 + 1 + 3 = 666.

It is not a de Polignac number, because 18357813 - 2¹⁶ = 18292277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18357113) 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 7 ways as a sum of consecutive naturals, for example, 339933 + ... + 339986.

It is an arithmetic number, because the mean of its divisors is an integer number (3399600).

Almost surely, 2^18357813 is an apocalyptic number.

It is an amenable number.

18357813 is a deficient number, since it is larger than the sum of its proper divisors (8838987).

18357813 is an equidigital number, since it uses as much as digits as its factorization.

18357813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679928 (or 679922 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 18357813 is about 4284.6018484802. The cubic root of 18357813 is about 263.7993051135.

The spelling of 18357813 in words is "eighteen million, three hundred fifty-seven thousand, eight hundred thirteen".