1266831 has 6 divisors (see below), whose sum is σ = 1829880. Its totient is φ = 844548.

The previous prime is 1266799. The next prime is 1266841. The reversal of 1266831 is 1386621.

It is not a de Polignac number, because 1266831 - 2⁵ = 1266799 is a prime.

It is a super-2 number, since 2×1266831² = 3209721565122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1266795 and 1266804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266841) 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 5 ways as a sum of consecutive naturals, for example, 70371 + ... + 70388.

It is an arithmetic number, because the mean of its divisors is an integer number (304980).

2^1266831 is an apocalyptic number.

1266831 is a deficient number, since it is larger than the sum of its proper divisors (563049).

1266831 is a wasteful number, since it uses less digits than its factorization.

1266831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140765 (or 140762 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1266831 is about 1125.5358723737. The cubic root of 1266831 is about 108.2030644556.

The spelling of 1266831 in words is "one million, two hundred sixty-six thousand, eight hundred thirty-one".