1285831 has 8 divisors (see below), whose sum is σ = 1346400. Its totient is φ = 1226400.

The previous prime is 1285813. The next prime is 1285841. The reversal of 1285831 is 1385821.

1285831 = 59² + 60² + ... + 159².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1285831 - 2⁵ = 1285799 is a prime.

It is a super-2 number, since 2×1285831² = 3306722721122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285811) 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 7 ways as a sum of consecutive naturals, for example, 2710 + ... + 3148.

It is an arithmetic number, because the mean of its divisors is an integer number (168300).

2^1285831 is an apocalyptic number.

1285831 is a deficient number, since it is larger than the sum of its proper divisors (60569).

1285831 is a wasteful number, since it uses less digits than its factorization.

1285831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569.

The product of its digits is 1920, while the sum is 28.

The square root of 1285831 is about 1133.9448840221. The cubic root of 1285831 is about 108.7413275332.

It can be divided in two parts, 1285 and 831, that added together give a square (2116 = 46²).

The spelling of 1285831 in words is "one million, two hundred eighty-five thousand, eight hundred thirty-one".