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872831 = 1751343
BaseRepresentation
bin11010101000101111111
31122100022002
43111011333
5210412311
630412515
710263461
oct3250577
91570262
10872831
11546853
1236113b
1324738b
1418a131
1512393b
hexd517f

872831 has 4 divisors (see below), whose sum is σ = 924192. Its totient is φ = 821472.

The previous prime is 872791. The next prime is 872843. The reversal of 872831 is 138278.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-872831 is a prime.

It is a super-2 number, since 2×8728312 = 1523667909122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 872794 and 872803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25655 + ... + 25688.

It is an arithmetic number, because the mean of its divisors is an integer number (231048).

2872831 is an apocalyptic number.

872831 is a deficient number, since it is larger than the sum of its proper divisors (51361).

872831 is a wasteful number, since it uses less digits than its factorization.

872831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51360.

The product of its digits is 2688, while the sum is 29.

The square root of 872831 is about 934.2542480503. The cubic root of 872831 is about 95.5674623606.

The spelling of 872831 in words is "eight hundred seventy-two thousand, eight hundred thirty-one".

Divisors: 1 17 51343 872831