1286667 has 6 divisors (see below), whose sum is σ = 1858532. Its totient is φ = 857772.

The previous prime is 1286657. The next prime is 1286669. The reversal of 1286667 is 7666821.

It is a happy number.

It is not a de Polignac number, because 1286667 - 2¹² = 1282571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71473 + ... + 71490.

2^1286667 is an apocalyptic number.

1286667 is a deficient number, since it is larger than the sum of its proper divisors (571865).

1286667 is a wasteful number, since it uses less digits than its factorization.

1286667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142969 (or 142966 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1286667 is about 1134.3134487433. The cubic root of 1286667 is about 108.7648889642.

It can be divided in two parts, 1286 and 667, that added together give a triangular number (1953 = T₆₂).

The spelling of 1286667 in words is "one million, two hundred eighty-six thousand, six hundred sixty-seven".