1280660 has 12 divisors (see below), whose sum is σ = 2689428. Its totient is φ = 512256.

The previous prime is 1280659. The next prime is 1280677. The reversal of 1280660 is 660821.

It can be written as a sum of positive squares in 2 ways, for example, as 925444 + 355216 = 962^2 + 596^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31997 + ... + 32036.

It is an arithmetic number, because the mean of its divisors is an integer number (224119).

2^1280660 is an apocalyptic number.

1280660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280660 is an abundant number, since it is smaller than the sum of its proper divisors (1408768).

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

1280660 is a wasteful number, since it uses less digits than its factorization.

1280660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64042 (or 64040 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1280660 is about 1131.6624938558. The cubic root of 1280660 is about 108.5953630784.

The spelling of 1280660 in words is "one million, two hundred eighty thousand, six hundred sixty".