878138 has 8 divisors (see below), whose sum is σ = 1349460. Its totient is φ = 428320.

The previous prime is 878131. The next prime is 878147. The reversal of 878138 is 831878.

It can be written as a sum of positive squares in 2 ways, for example, as 877969 + 169 = 937^2 + 13^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×878138² = 1542252694088, which contains 22 as substring.

Its product of digits (10752) is a multiple of the sum of its prime divisors (10752).

It is a junction number, because it is equal to n+sod(n) for n = 878098 and 878107.

It is not an unprimeable number, because it can be changed into a prime (878131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5273 + ... + 5436.

2⁸⁷⁸¹³⁸ is an apocalyptic number.

878138 is a deficient number, since it is larger than the sum of its proper divisors (471322).

878138 is a wasteful number, since it uses less digits than its factorization.

878138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10752.

The product of its digits is 10752, while the sum is 35.

The square root of 878138 is about 937.0901770908. The cubic root of 878138 is about 95.7607613562.

The spelling of 878138 in words is "eight hundred seventy-eight thousand, one hundred thirty-eight".