168700138 has 4 divisors (see below), whose sum is σ = 253050210. Its totient is φ = 84350068.

The previous prime is 168700093. The next prime is 168700141. The reversal of 168700138 is 831007861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 137194369 + 31505769 = 11713^2 + 5613^2 .

It is a super-2 number, since 2×168700138² = 56919473122438088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42175033 + ... + 42175036.

Almost surely, 2^168700138 is an apocalyptic number.

168700138 is a deficient number, since it is larger than the sum of its proper divisors (84350072).

168700138 is an equidigital number, since it uses as much as digits as its factorization.

168700138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84350071.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 168700138 is about 12988.4617257010. The cubic root of 168700138 is about 552.5502918260.

Adding to 168700138 its reverse (831007861), we get a palindrome (999707999).

The spelling of 168700138 in words is "one hundred sixty-eight million, seven hundred thousand, one hundred thirty-eight".