879781 has 4 divisors (see below), whose sum is σ = 1005472. Its totient is φ = 754092.

The previous prime is 879743. The next prime is 879797. The reversal of 879781 is 187978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 879781 - 2⁷ = 879653 is a prime.

It is a super-2 number, since 2×879781² = 1548029215922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879701) 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, 62835 + ... + 62848.

It is an arithmetic number, because the mean of its divisors is an integer number (251368).

2⁸⁷⁹⁷⁸¹ is an apocalyptic number.

It is an amenable number.

879781 is a deficient number, since it is larger than the sum of its proper divisors (125691).

879781 is a wasteful number, since it uses less digits than its factorization.

879781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125690.

The product of its digits is 28224, while the sum is 40.

The square root of 879781 is about 937.9664173093. The cubic root of 879781 is about 95.8204470806.

The spelling of 879781 in words is "eight hundred seventy-nine thousand, seven hundred eighty-one".