1309986 has 32 divisors (see below), whose sum is σ = 3084480. Its totient is φ = 410688.

The previous prime is 1309963. The next prime is 1309999. The reversal of 1309986 is 6899031.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1309986.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (96390).

2^1309986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1542240).

1309986 is an abundant number, since it is smaller than the sum of its proper divisors (1774494).

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

1309986 is a wasteful number, since it uses less digits than its factorization.

1309986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1309986 is about 1144.5461982812. The cubic root of 1309986 is about 109.4180283493.

The spelling of 1309986 in words is "one million, three hundred nine thousand, nine hundred eighty-six".