1288860 has 24 divisors (see below), whose sum is σ = 3608976. Its totient is φ = 343680.

The previous prime is 1288853. The next prime is 1288871. The reversal of 1288860 is 688821.

It is a super-2 number, since 2×1288860² = 3322320199200, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 10681 + ... + 10800.

It is an arithmetic number, because the mean of its divisors is an integer number (150374).

2^1288860 is an apocalyptic number.

1288860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288860 is an abundant number, since it is smaller than the sum of its proper divisors (2320116).

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

1288860 is a wasteful number, since it uses less digits than its factorization.

1288860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21493 (or 21491 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1288860 is about 1135.2797012190. The cubic root of 1288860 is about 108.8266469838.

The spelling of 1288860 in words is "one million, two hundred eighty-eight thousand, eight hundred sixty".