1287872 has 14 divisors (see below), whose sum is σ = 2555748. Its totient is φ = 643904.

The previous prime is 1287857. The next prime is 1287883. The reversal of 1287872 is 2787821.

It is a super-2 number, since 2×1287872² = 3317228576768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998 + ... + 10125.

2^1287872 is an apocalyptic number.

It is an amenable number.

1287872 is a deficient number, since it is larger than the sum of its proper divisors (1267876).

1287872 is an equidigital number, since it uses as much as digits as its factorization.

1287872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20135 (or 20125 counting only the distinct ones).

The product of its digits is 12544, while the sum is 35.

The square root of 1287872 is about 1134.8444827376. The cubic root of 1287872 is about 108.7988321674.

It can be divided in two parts, 128 and 7872, that added together give a cube (8000 = 20³).

The spelling of 1287872 in words is "one million, two hundred eighty-seven thousand, eight hundred seventy-two".