1280015 has 24 divisors (see below), whose sum is σ = 1823472. Its totient is φ = 852480.

The previous prime is 1279997. The next prime is 1280023. The reversal of 1280015 is 5100821.

It is not a de Polignac number, because 1280015 - 2¹⁴ = 1263631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1279975 and 1280002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34577 + ... + 34613.

It is an arithmetic number, because the mean of its divisors is an integer number (75978).

2^1280015 is an apocalyptic number.

1280015 is a deficient number, since it is larger than the sum of its proper divisors (543457).

1280015 is a wasteful number, since it uses less digits than its factorization.

1280015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1280015 is about 1131.3774790051. The cubic root of 1280015 is about 108.5771287899.

Adding to 1280015 its reverse (5100821), we get a palindrome (6380836).

The spelling of 1280015 in words is "one million, two hundred eighty thousand, fifteen".