1287880 has 32 divisors (see below), whose sum is σ = 3162240. Its totient is φ = 468160.

The previous prime is 1287857. The next prime is 1287883. The reversal of 1287880 is 887821.

It is not an unprimeable number, because it can be changed into a prime (1287883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1024 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (98820).

2^1287880 is an apocalyptic number.

1287880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287880 is an abundant number, since it is smaller than the sum of its proper divisors (1874360).

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

1287880 is a wasteful number, since it uses less digits than its factorization.

1287880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949 (or 2945 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1287880 is about 1134.8480074442. The cubic root of 1287880 is about 108.7990574457.

It can be divided in two parts, 128 and 7880, that added together give a palindrome (8008).

The spelling of 1287880 in words is "one million, two hundred eighty-seven thousand, eight hundred eighty".