1280831 has 8 divisors (see below), whose sum is σ = 1380240. Its totient is φ = 1184128.

The previous prime is 1280821. The next prime is 1280833. The reversal of 1280831 is 1380821.

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 1280831 - 2⁶ = 1280767 is a prime.

It is a super-2 number, since 2×1280831² = 3281056101122, 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 = 1280797 and 1280806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280833) 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, 365 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (172530).

2^1280831 is an apocalyptic number.

1280831 is a deficient number, since it is larger than the sum of its proper divisors (99409).

1280831 is a wasteful number, since it uses less digits than its factorization.

1280831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1280831 is about 1131.7380438953. The cubic root of 1280831 is about 108.6001962583.

The spelling of 1280831 in words is "one million, two hundred eighty thousand, eight hundred thirty-one".