842725 has 12 divisors (see below), whose sum is σ = 1125796. Its totient is φ = 622080.

The previous prime is 842701. The next prime is 842729. The reversal of 842725 is 527248.

It is a Cunningham number, because it is equal to 918²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 66564 + 776161 = 258^2 + 881^2 .

It is not a de Polignac number, because 842725 - 2¹⁷ = 711653 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 842693 and 842702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842729) 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 11 ways as a sum of consecutive naturals, for example, 972 + ... + 1621.

2⁸⁴²⁷²⁵ is an apocalyptic number.

It is an amenable number.

842725 is a deficient number, since it is larger than the sum of its proper divisors (283071).

842725 is a wasteful number, since it uses less digits than its factorization.

842725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616 (or 2611 counting only the distinct ones).

The product of its digits is 4480, while the sum is 28.

The square root of 842725 is about 918.0005446621. Note that the first 3 decimals coincide. The cubic root of 842725 is about 94.4557989681.

It can be divided in two parts, 84 and 2725, that added together give a square (2809 = 53²).

The spelling of 842725 in words is "eight hundred forty-two thousand, seven hundred twenty-five".