1287886 has 8 divisors (see below), whose sum is σ = 2045520. Its totient is φ = 606048.

The previous prime is 1287883. The next prime is 1287887. The reversal of 1287886 is 6887821.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 18906 + ... + 18973.

It is an arithmetic number, because the mean of its divisors is an integer number (255690).

2^1287886 is an apocalyptic number.

1287886 is a deficient number, since it is larger than the sum of its proper divisors (757634).

1287886 is a wasteful number, since it uses less digits than its factorization.

1287886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37898.

The product of its digits is 43008, while the sum is 40.

The square root of 1287886 is about 1134.8506509669. The cubic root of 1287886 is about 108.7992264038.

The spelling of 1287886 in words is "one million, two hundred eighty-seven thousand, eight hundred eighty-six".