18383138 has 4 divisors (see below), whose sum is σ = 27574710. Its totient is φ = 9191568.

The previous prime is 18383119. The next prime is 18383201. The reversal of 18383138 is 83138381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83138381 = 17 ⋅4890493.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 124609 = 4273^2 + 353^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18383098 and 18383107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595783 + ... + 4595786.

Almost surely, 2^18383138 is an apocalyptic number.

18383138 is a deficient number, since it is larger than the sum of its proper divisors (9191572).

18383138 is an equidigital number, since it uses as much as digits as its factorization.

18383138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191571.

The product of its digits is 13824, while the sum is 35.

The square root of 18383138 is about 4287.5561803899. The cubic root of 18383138 is about 263.9205549902.

The spelling of 18383138 in words is "eighteen million, three hundred eighty-three thousand, one hundred thirty-eight".