1287065 has 8 divisors (see below), whose sum is σ = 1663368. Its totient is φ = 950400.

The previous prime is 1287061. The next prime is 1287067. The reversal of 1287065 is 5607821.

It can be written as a sum of positive squares in 4 ways, for example, as 85849 + 1201216 = 293^2 + 1096^2 .

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

It is not a de Polignac number, because 1287065 - 2² = 1287061 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287061) 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, 9836 + ... + 9965.

It is an arithmetic number, because the mean of its divisors is an integer number (207921).

2^1287065 is an apocalyptic number.

It is an amenable number.

1287065 is a deficient number, since it is larger than the sum of its proper divisors (376303).

1287065 is a wasteful number, since it uses less digits than its factorization.

1287065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19819.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1287065 is about 1134.4888716951. The cubic root of 1287065 is about 108.7761024233.

The spelling of 1287065 in words is "one million, two hundred eighty-seven thousand, sixty-five".