18149938 has 8 divisors (see below), whose sum is σ = 27262620. Its totient is φ = 9062400.

The previous prime is 18149933. The next prime is 18149941. The reversal of 18149938 is 83994181.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 27889 = 4257^2 + 167^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18149894 and 18149903.

It is not an unprimeable number, because it can be changed into a prime (18149933) 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 3 ways as a sum of consecutive naturals, for example, 4363 + ... + 7438.

Almost surely, 2^18149938 is an apocalyptic number.

18149938 is a deficient number, since it is larger than the sum of its proper divisors (9112682).

18149938 is a wasteful number, since it uses less digits than its factorization.

18149938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12572.

The product of its digits is 62208, while the sum is 43.

The square root of 18149938 is about 4260.2744043078. The cubic root of 18149938 is about 262.7998110346.

The spelling of 18149938 in words is "eighteen million, one hundred forty-nine thousand, nine hundred thirty-eight".