1287605 has 16 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 912000.

The previous prime is 1287593. The next prime is 1287607. The reversal of 1287605 is 5067821.

It is not a de Polignac number, because 1287605 - 2⁴ = 1287589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1970 + ... + 2540.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1287605 is an apocalyptic number.

It is an amenable number.

1287605 is a deficient number, since it is larger than the sum of its proper divisors (442123).

1287605 is a wasteful number, since it uses less digits than its factorization.

1287605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628.

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

The square root of 1287605 is about 1134.7268393759. The cubic root of 1287605 is about 108.7913129688.

The spelling of 1287605 in words is "one million, two hundred eighty-seven thousand, six hundred five".