870138 has 12 divisors (see below), whose sum is σ = 1885338. Its totient is φ = 290040.

The previous prime is 870137. The next prime is 870151. The reversal of 870138 is 831078.

It can be written as a sum of positive squares in only one way, i.e., 613089 + 257049 = 783^2 + 507^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (870131) 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, 24153 + ... + 24188.

2⁸⁷⁰¹³⁸ is an apocalyptic number.

870138 is an abundant number, since it is smaller than the sum of its proper divisors (1015200).

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

870138 is a wasteful number, since it uses less digits than its factorization.

870138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48349 (or 48346 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 870138 is about 932.8118781405. The cubic root of 870138 is about 95.4690743500.

Subtracting from 870138 its reverse (831078), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 870138 in words is "eight hundred seventy thousand, one hundred thirty-eight".