18398413 has 16 divisors (see below), whose sum is σ = 21151872. Its totient is φ = 15972000.

The previous prime is 18398353. The next prime is 18398417. The reversal of 18398413 is 31489381.

It is not a de Polignac number, because 18398413 - 2²¹ = 16301261 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398417) 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 15 ways as a sum of consecutive naturals, for example, 30313 + ... + 30913.

It is an arithmetic number, because the mean of its divisors is an integer number (1321992).

Almost surely, 2^18398413 is an apocalyptic number.

It is an amenable number.

18398413 is a deficient number, since it is larger than the sum of its proper divisors (2753459).

18398413 is an equidigital number, since it uses as much as digits as its factorization.

18398413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 635 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 18398413 is about 4289.3371282752. The cubic root of 18398413 is about 263.9936341058.

It can be divided in two parts, 183 and 98413, that added together give a square (98596 = 314²).

The spelling of 18398413 in words is "eighteen million, three hundred ninety-eight thousand, four hundred thirteen".