1309866 has 16 divisors (see below), whose sum is σ = 2681184. Its totient is φ = 426384.

The previous prime is 1309849. The next prime is 1309877. The reversal of 1309866 is 6689031.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2281 + ... + 2796.

It is an arithmetic number, because the mean of its divisors is an integer number (167574).

2^1309866 is an apocalyptic number.

1309866 is an abundant number, since it is smaller than the sum of its proper divisors (1371318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1309866 is a wasteful number, since it uses less digits than its factorization.

1309866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1309866 is about 1144.4937745571. The cubic root of 1309866 is about 109.4146872030.

It can be divided in two parts, 13098 and 66, that multiplied together give a palindrome (864468).

The spelling of 1309866 in words is "one million, three hundred nine thousand, eight hundred sixty-six".