1288660 has 12 divisors (see below), whose sum is σ = 2706228. Its totient is φ = 515456.

The previous prime is 1288657. The next prime is 1288691. The reversal of 1288660 is 668821.

It can be written as a sum of positive squares in 2 ways, for example, as 521284 + 767376 = 722^2 + 876^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32197 + ... + 32236.

It is an arithmetic number, because the mean of its divisors is an integer number (225519).

2^1288660 is an apocalyptic number.

1288660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288660 is an abundant number, since it is smaller than the sum of its proper divisors (1417568).

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

1288660 is a wasteful number, since it uses less digits than its factorization.

1288660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64442 (or 64440 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1288660 is about 1135.1916137816. The cubic root of 1288660 is about 108.8210176020.

The spelling of 1288660 in words is "one million, two hundred eighty-eight thousand, six hundred sixty".