1280931 has 8 divisors (see below), whose sum is σ = 1731600. Its totient is φ = 842112.

The previous prime is 1280921. The next prime is 1280947. The reversal of 1280931 is 1390821.

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

It is not a de Polignac number, because 1280931 - 2⁷ = 1280803 is a prime.

It is a super-2 number, since 2×1280931² = 3281568453522, which contains 22 as substring.

1280931 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280921) 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 7 ways as a sum of consecutive naturals, for example, 2706 + ... + 3143.

It is an arithmetic number, because the mean of its divisors is an integer number (216450).

2^1280931 is an apocalyptic number.

1280931 is a deficient number, since it is larger than the sum of its proper divisors (450669).

1280931 is an equidigital number, since it uses as much as digits as its factorization.

1280931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5925.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1280931 is about 1131.7822228680. The cubic root of 1280931 is about 108.6030224800.

It can be divided in two parts, 1280 and 931, that added together give a triangular number (2211 = T₆₆).

The spelling of 1280931 in words is "one million, two hundred eighty thousand, nine hundred thirty-one".