1287685 has 8 divisors (see below), whose sum is σ = 1766016. Its totient is φ = 882960.

The previous prime is 1287683. The next prime is 1287691. The reversal of 1287685 is 5867821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1287685 - 2¹ = 1287683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287683) 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, 18361 + ... + 18430.

It is an arithmetic number, because the mean of its divisors is an integer number (220752).

2^1287685 is an apocalyptic number.

It is an amenable number.

1287685 is a deficient number, since it is larger than the sum of its proper divisors (478331).

1287685 is an equidigital number, since it uses as much as digits as its factorization.

1287685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36803.

The product of its digits is 26880, while the sum is 37.

The square root of 1287685 is about 1134.7620896029. The cubic root of 1287685 is about 108.7935660213.

It can be divided in two parts, 12876 and 85, that multiplied together give a triangular number (1094460 = T₁₄₇₉).

The spelling of 1287685 in words is "one million, two hundred eighty-seven thousand, six hundred eighty-five".