1280670 has 16 divisors (see below), whose sum is σ = 3073680. Its totient is φ = 341504.

The previous prime is 1280659. The next prime is 1280677. The reversal of 1280670 is 760821.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280670.

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 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, 21315 + ... + 21374.

It is an arithmetic number, because the mean of its divisors is an integer number (192105).

2^1280670 is an apocalyptic number.

1280670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1280670 is an abundant number, since it is smaller than the sum of its proper divisors (1793010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1280670 is a wasteful number, since it uses less digits than its factorization.

1280670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42699.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1280670 is about 1131.6669121256. Note that the first 3 decimals coincide. The cubic root of 1280670 is about 108.5956457323.

The spelling of 1280670 in words is "one million, two hundred eighty thousand, six hundred seventy".