1309706 has 4 divisors (see below), whose sum is σ = 1964562. Its totient is φ = 654852.

The previous prime is 1309699. The next prime is 1309709. The reversal of 1309706 is 6079031.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 259081 = 1025^2 + 509^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1309709) by changing a digit.

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, 327425 + ... + 327428.

2^1309706 is an apocalyptic number.

1309706 is a deficient number, since it is larger than the sum of its proper divisors (654856).

1309706 is an equidigital number, since it uses as much as digits as its factorization.

1309706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654855.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 1309706 is about 1144.4238725228. The cubic root of 1309706 is about 109.4102320239.

The spelling of 1309706 in words is "one million, three hundred nine thousand, seven hundred six".