1280439 has 6 divisors (see below), whose sum is σ = 1849536. Its totient is φ = 853620.

The previous prime is 1280431. The next prime is 1280453. The reversal of 1280439 is 9340821.

It is not a de Polignac number, because 1280439 - 2³ = 1280431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71127 + ... + 71144.

It is an arithmetic number, because the mean of its divisors is an integer number (308256).

2^1280439 is an apocalyptic number.

1280439 is a deficient number, since it is larger than the sum of its proper divisors (569097).

1280439 is a wasteful number, since it uses less digits than its factorization.

1280439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142277 (or 142274 counting only the distinct ones).

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

The square root of 1280439 is about 1131.5648456894. The cubic root of 1280439 is about 108.5891160506.

The spelling of 1280439 in words is "one million, two hundred eighty thousand, four hundred thirty-nine".