816138 has 12 divisors (see below), whose sum is σ = 1768338. Its totient is φ = 272040.

The previous prime is 816133. The next prime is 816157. The reversal of 816138 is 831618.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 729 = 903^2 + 27^2 .

It is not an unprimeable number, because it can be changed into a prime (816131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22653 + ... + 22688.

2⁸¹⁶¹³⁸ is an apocalyptic number.

816138 is an abundant number, since it is smaller than the sum of its proper divisors (952200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816138 is a wasteful number, since it uses less digits than its factorization.

816138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45349 (or 45346 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 816138 is about 903.4035643056. The cubic root of 816138 is about 93.4518420918.

The spelling of 816138 in words is "eight hundred sixteen thousand, one hundred thirty-eight".