1280045 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 922944.

The previous prime is 1280023. The next prime is 1280101. The reversal of 1280045 is 5400821.

It is a cyclic number.

It is not a de Polignac number, because 1280045 - 2¹⁰ = 1279021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279999 and 1280026.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2846 + ... + 3264.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^1280045 is an apocalyptic number.

It is an amenable number.

1280045 is a deficient number, since it is larger than the sum of its proper divisors (413395).

1280045 is a wasteful number, since it uses less digits than its factorization.

1280045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1280045 is about 1131.3907371019. The cubic root of 1280045 is about 108.5779770321.

Adding to 1280045 its reverse (5400821), we get a palindrome (6680866).

The spelling of 1280045 in words is "one million, two hundred eighty thousand, forty-five".