318722 has 4 divisors (see below), whose sum is σ = 478086. Its totient is φ = 159360.

The previous prime is 318713. The next prime is 318737. The reversal of 318722 is 227813.

Added to its reverse (227813) it gives a triangular number (546535 = T₁₀₄₅).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227813 = 409 ⋅557.

It can be written as a sum of positive squares in only one way, i.e., 312481 + 6241 = 559^2 + 79^2 .

It is an unprimeable number.

318722 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79679 + ... + 79682.

2³¹⁸⁷²² is an apocalyptic number.

318722 is a deficient number, since it is larger than the sum of its proper divisors (159364).

318722 is a wasteful number, since it uses less digits than its factorization.

318722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159363.

The product of its digits is 672, while the sum is 23.

The square root of 318722 is about 564.5546917704. The cubic root of 318722 is about 68.3078601596.

Adding to 318722 its reverse (227813), we get a triangular number (546535 = T₁₀₄₅).

Subtracting from 318722 its reverse (227813), we obtain a palindrome (90909).

The spelling of 318722 in words is "three hundred eighteen thousand, seven hundred twenty-two".