18151138 has 8 divisors (see below), whose sum is σ = 28828332. Its totient is φ = 8541696.

The previous prime is 18151123. The next prime is 18151153. The reversal of 18151138 is 83115181.

It is an interprime number because it is at equal distance from previous prime (18151123) and next prime (18151153).

It can be written as a sum of positive squares in 2 ways, for example, as 17280649 + 870489 = 4157^2 + 933^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 266895 + ... + 266962.

Almost surely, 2^18151138 is an apocalyptic number.

18151138 is a deficient number, since it is larger than the sum of its proper divisors (10677194).

18151138 is a wasteful number, since it uses less digits than its factorization.

18151138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533876.

The product of its digits is 960, while the sum is 28.

The square root of 18151138 is about 4260.4152379786. The cubic root of 18151138 is about 262.8056026581.

The spelling of 18151138 in words is "eighteen million, one hundred fifty-one thousand, one hundred thirty-eight".