1280349 has 12 divisors (see below), whose sum is σ = 2113696. Its totient is φ = 731592.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280349 is 9430821.

It is not a de Polignac number, because 1280349 - 2⁴ = 1280333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280309) 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 11 ways as a sum of consecutive naturals, for example, 10099 + ... + 10224.

2^1280349 is an apocalyptic number.

It is an amenable number.

1280349 is a deficient number, since it is larger than the sum of its proper divisors (833347).

1280349 is a wasteful number, since it uses less digits than its factorization.

1280349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20336 (or 20333 counting only the distinct ones).

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

The square root of 1280349 is about 1131.5250770531. The cubic root of 1280349 is about 108.5865718061.

The spelling of 1280349 in words is "one million, two hundred eighty thousand, three hundred forty-nine".