1287001 has 8 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 1244208.

The previous prime is 1286983. The next prime is 1287007. The reversal of 1287001 is 1007821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287001 - 2⁵ = 1286969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287001.

It is not an unprimeable number, because it can be changed into a prime (1287007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6435 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

2^1287001 is an apocalyptic number.

It is an amenable number.

1287001 is a deficient number, since it is larger than the sum of its proper divisors (43559).

1287001 is a wasteful number, since it uses less digits than its factorization.

1287001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1287001 is about 1134.4606648095. The cubic root of 1287001 is about 108.7742994100.

The spelling of 1287001 in words is "one million, two hundred eighty-seven thousand, one".