1280673 has 6 divisors (see below), whose sum is σ = 1849874. Its totient is φ = 853776.

The previous prime is 1280659. The next prime is 1280677. The reversal of 1280673 is 3760821.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 88209 = 1092^2 + 297^2 .

It is not a de Polignac number, because 1280673 - 2⁸ = 1280417 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 71140 + ... + 71157.

2^1280673 is an apocalyptic number.

It is an amenable number.

1280673 is a deficient number, since it is larger than the sum of its proper divisors (569201).

1280673 is a wasteful number, since it uses less digits than its factorization.

1280673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142303 (or 142300 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1280673 is about 1131.6682376032. The cubic root of 1280673 is about 108.5957305282.

It can be divided in two parts, 1280 and 673, that added together give a triangular number (1953 = T₆₂).

The spelling of 1280673 in words is "one million, two hundred eighty thousand, six hundred seventy-three".