1318138 has 4 divisors (see below), whose sum is σ = 1977210. Its totient is φ = 659068.

The previous prime is 1318103. The next prime is 1318139. The reversal of 1318138 is 8318131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8318131 = 73 ⋅113947.

It can be written as a sum of positive squares in only one way, i.e., 954529 + 363609 = 977^2 + 603^2 .

It is not an unprimeable number, because it can be changed into a prime (1318139) 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 as a sum of consecutive naturals, namely, 329533 + ... + 329536.

2^1318138 is an apocalyptic number.

1318138 is a deficient number, since it is larger than the sum of its proper divisors (659072).

1318138 is an equidigital number, since it uses as much as digits as its factorization.

1318138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659071.

The product of its digits is 576, while the sum is 25.

The square root of 1318138 is about 1148.1019118528. The cubic root of 1318138 is about 109.6445274345.

The spelling of 1318138 in words is "one million, three hundred eighteen thousand, one hundred thirty-eight".