878434 has 4 divisors (see below), whose sum is σ = 1317654. Its totient is φ = 439216.

The previous prime is 878419. The next prime is 878443. The reversal of 878434 is 434878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434878 = 2 ⋅217439.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 41209 = 915^2 + 203^2 .

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 878434.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 219607 + ... + 219610.

2⁸⁷⁸⁴³⁴ is an apocalyptic number.

878434 is a deficient number, since it is larger than the sum of its proper divisors (439220).

878434 is a wasteful number, since it uses less digits than its factorization.

878434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439219.

The product of its digits is 21504, while the sum is 34.

The square root of 878434 is about 937.2480994913. The cubic root of 878434 is about 95.7715197264.

Subtracting from 878434 its reverse (434878), we obtain a square (443556 = 666²).

The spelling of 878434 in words is "eight hundred seventy-eight thousand, four hundred thirty-four".