718138 has 4 divisors (see below), whose sum is σ = 1077210. Its totient is φ = 359068.

The previous prime is 718121. The next prime is 718139. The reversal of 718138 is 831817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831817 = 7 ⋅118831.

It can be written as a sum of positive squares in only one way, i.e., 717409 + 729 = 847^2 + 27^2 .

It is not an unprimeable number, because it can be changed into a prime (718139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 179533 + ... + 179536.

2⁷¹⁸¹³⁸ is an apocalyptic number.

718138 is a deficient number, since it is larger than the sum of its proper divisors (359072).

718138 is a wasteful number, since it uses less digits than its factorization.

718138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359071.

The product of its digits is 1344, while the sum is 28.

The square root of 718138 is about 847.4302331166. The cubic root of 718138 is about 89.5507654946.

It can be divided in two parts, 7 and 18138, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 718138 in words is "seven hundred eighteen thousand, one hundred thirty-eight".