1287879 has 8 divisors (see below), whose sum is σ = 1729152. Its totient is φ = 852600.

The previous prime is 1287857. The next prime is 1287883. The reversal of 1287879 is 9787821.

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

It is not a de Polignac number, because 1287879 - 2⁷ = 1287751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1287879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287829) 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, 969 + ... + 1874.

It is an arithmetic number, because the mean of its divisors is an integer number (216144).

2^1287879 is an apocalyptic number.

1287879 is a deficient number, since it is larger than the sum of its proper divisors (441273).

1287879 is a wasteful number, since it uses less digits than its factorization.

1287879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997.

The product of its digits is 56448, while the sum is 42.

The square root of 1287879 is about 1134.8475668564. The cubic root of 1287879 is about 108.7990292860.

The spelling of 1287879 in words is "one million, two hundred eighty-seven thousand, eight hundred seventy-nine".