1286587 has 2 divisors, whose sum is σ = 1286588. Its totient is φ = 1286586.

The previous prime is 1286581. The next prime is 1286617. The reversal of 1286587 is 7856821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1286587 is a prime.

It is a super-2 number, since 2×1286587² = 3310612217138, which contains 22 as substring.

It is a Chen prime.

1286587 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1286581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643293 + 643294.

It is an arithmetic number, because the mean of its divisors is an integer number (643294).

2^1286587 is an apocalyptic number.

1286587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286587 is an equidigital number, since it uses as much as digits as its factorization.

1286587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 1286587 is about 1134.2781845738. The cubic root of 1286587 is about 108.7626347235.

The spelling of 1286587 in words is "one million, two hundred eighty-six thousand, five hundred eighty-seven".