1286911 has 4 divisors (see below), whose sum is σ = 1290024. Its totient is φ = 1283800.

The previous prime is 1286881. The next prime is 1286939. The reversal of 1286911 is 1196821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1196821 = 67 ⋅17863.

It is a cyclic number.

It is not a de Polignac number, because 1286911 - 2⁷ = 1286783 is a prime.

It is a super-2 number, since 2×1286911² = 3312279843842, which contains 22 as substring.

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 1286911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (322506).

2^1286911 is an apocalyptic number.

1286911 is a deficient number, since it is larger than the sum of its proper divisors (3113).

1286911 is an equidigital number, since it uses as much as digits as its factorization.

1286911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its digits is 864, while the sum is 28.

The square root of 1286911 is about 1134.4209976900. The cubic root of 1286911 is about 108.7717638214.

It can be divided in two parts, 12869 and 11, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 1286911 in words is "one million, two hundred eighty-six thousand, nine hundred eleven".