318742138 has 32 divisors (see below), whose sum is σ = 591272640. Its totient is φ = 126696960.

The previous prime is 318742133. The next prime is 318742183. The reversal of 318742138 is 831247813.

It is a super-2 number, since 2×318742138² = 203193101073622088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 318742097 and 318742106.

It is not an unprimeable number, because it can be changed into a prime (318742133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23895 + ... + 34762.

It is an arithmetic number, because the mean of its divisors is an integer number (18477270).

Almost surely, 2^318742138 is an apocalyptic number.

318742138 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

318742138 is a deficient number, since it is larger than the sum of its proper divisors (272530502).

318742138 is a wasteful number, since it uses less digits than its factorization.

318742138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58702.

The product of its digits is 32256, while the sum is 37.

The square root of 318742138 is about 17853.3508899590. The cubic root of 318742138 is about 683.0929877461.

The spelling of 318742138 in words is "three hundred eighteen million, seven hundred forty-two thousand, one hundred thirty-eight".