1286366 has 4 divisors (see below), whose sum is σ = 1929552. Its totient is φ = 643182.

The previous prime is 1286359. The next prime is 1286371. The reversal of 1286366 is 6636821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6636821 = 31 ⋅214091.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321590 + ... + 321593.

It is an arithmetic number, because the mean of its divisors is an integer number (482388).

2^1286366 is an apocalyptic number.

1286366 is a deficient number, since it is larger than the sum of its proper divisors (643186).

1286366 is an equidigital number, since it uses as much as digits as its factorization.

1286366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643185.

The product of its digits is 10368, while the sum is 32.

The square root of 1286366 is about 1134.1807616072. The cubic root of 1286366 is about 108.7564068978.

The spelling of 1286366 in words is "one million, two hundred eighty-six thousand, three hundred sixty-six".