878417 has 4 divisors (see below), whose sum is σ = 902196. Its totient is φ = 854640.

The previous prime is 878413. The next prime is 878419. The reversal of 878417 is 714878.

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

It can be written as a sum of positive squares in 2 ways, for example, as 844561 + 33856 = 919^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 878417 - 2² = 878413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878411) 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, 11834 + ... + 11907.

It is an arithmetic number, because the mean of its divisors is an integer number (225549).

2⁸⁷⁸⁴¹⁷ is an apocalyptic number.

It is an amenable number.

878417 is a deficient number, since it is larger than the sum of its proper divisors (23779).

878417 is a wasteful number, since it uses less digits than its factorization.

878417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23778.

The product of its digits is 12544, while the sum is 35.

The square root of 878417 is about 937.2390303439. The cubic root of 878417 is about 95.7709019125.

The spelling of 878417 in words is "eight hundred seventy-eight thousand, four hundred seventeen".