18348538 has 8 divisors (see below), whose sum is σ = 29639988. Its totient is φ = 8468544.

The previous prime is 18348521. The next prime is 18348541. The reversal of 18348538 is 83584381.

It can be written as a sum of positive squares in 2 ways, for example, as 16867449 + 1481089 = 4107^2 + 1217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×18348538³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18348538.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352831 + ... + 352882.

Almost surely, 2^18348538 is an apocalyptic number.

18348538 is a deficient number, since it is larger than the sum of its proper divisors (11291450).

18348538 is a wasteful number, since it uses less digits than its factorization.

18348538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705728.

The product of its digits is 92160, while the sum is 40.

The square root of 18348538 is about 4283.5193474525. The cubic root of 18348538 is about 263.7548707949.

The spelling of 18348538 in words is "eighteen million, three hundred forty-eight thousand, five hundred thirty-eight".