1287873 has 8 divisors (see below), whose sum is σ = 1908000. Its totient is φ = 858564.

The previous prime is 1287857. The next prime is 1287883. The reversal of 1287873 is 3787821.

It is not a de Polignac number, because 1287873 - 2⁴ = 1287857 is a prime.

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, 23823 + ... + 23876.

It is an arithmetic number, because the mean of its divisors is an integer number (238500).

2^1287873 is an apocalyptic number.

It is an amenable number.

1287873 is a deficient number, since it is larger than the sum of its proper divisors (620127).

1287873 is an equidigital number, since it uses as much as digits as its factorization.

1287873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47708 (or 47702 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 1287873 is about 1134.8449233265. The cubic root of 1287873 is about 108.7988603272.

It can be divided in two parts, 128 and 7873, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 1287873 in words is "one million, two hundred eighty-seven thousand, eight hundred seventy-three".