1286761 has 4 divisors (see below), whose sum is σ = 1470592. Its totient is φ = 1102932.

The previous prime is 1286711. The next prime is 1286773. The reversal of 1286761 is 1676821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1676821 = 31 ⋅54091.

It is a cyclic number.

It is not a de Polignac number, because 1286761 - 2⁷ = 1286633 is a prime.

It is a super-2 number, since 2×1286761² = 3311507742242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286711) 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, 91905 + ... + 91918.

It is an arithmetic number, because the mean of its divisors is an integer number (367648).

2^1286761 is an apocalyptic number.

It is an amenable number.

1286761 is a deficient number, since it is larger than the sum of its proper divisors (183831).

1286761 is an equidigital number, since it uses as much as digits as its factorization.

1286761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183830.

The product of its digits is 4032, while the sum is 31.

The square root of 1286761 is about 1134.3548827417. The cubic root of 1286761 is about 108.7675375777.

It can be divided in two parts, 128 and 6761, that added together give a square (6889 = 83²).

The spelling of 1286761 in words is "one million, two hundred eighty-six thousand, seven hundred sixty-one".