1280671 has 4 divisors (see below), whose sum is σ = 1463632. Its totient is φ = 1097712.

The previous prime is 1280659. The next prime is 1280677. The reversal of 1280671 is 1760821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1760821 = 457 ⋅3853.

It is not a de Polignac number, because 1280671 - 2⁹ = 1280159 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 (1280677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91470 + ... + 91483.

It is an arithmetic number, because the mean of its divisors is an integer number (365908).

2^1280671 is an apocalyptic number.

1280671 is a deficient number, since it is larger than the sum of its proper divisors (182961).

1280671 is an equidigital number, since it uses as much as digits as its factorization.

1280671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182960.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1280671 is about 1131.6673539517. The cubic root of 1280671 is about 108.5956739976.

It can be divided in two parts, 12806 and 71, that multiplied together give a triangular number (909226 = T₁₃₄₈).

The spelling of 1280671 in words is "one million, two hundred eighty thousand, six hundred seventy-one".