1280427 has 8 divisors (see below), whose sum is σ = 1739664. Its totient is φ = 837408.

The previous prime is 1280417. The next prime is 1280431. The reversal of 1280427 is 7240821.

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

It is not a de Polignac number, because 1280427 - 2¹¹ = 1278379 is a prime.

1280427 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1280397 and 1280406.

It is not an unprimeable number, because it can be changed into a prime (1280407) 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, 3868 + ... + 4185.

It is an arithmetic number, because the mean of its divisors is an integer number (217458).

2^1280427 is an apocalyptic number.

1280427 is a deficient number, since it is larger than the sum of its proper divisors (459237).

1280427 is an equidigital number, since it uses as much as digits as its factorization.

1280427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8109.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1280427 is about 1131.5595432853. The cubic root of 1280427 is about 108.5887768249.

The spelling of 1280427 in words is "one million, two hundred eighty thousand, four hundred twenty-seven".