1309444 has 12 divisors (see below), whose sum is σ = 2312604. Its totient is φ = 648704.

The previous prime is 1309421. The next prime is 1309463. The reversal of 1309444 is 4449031.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 1236544 = 270^2 + 1112^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 997 + ... + 1900.

It is an arithmetic number, because the mean of its divisors is an integer number (192717).

2^1309444 is an apocalyptic number.

It is an amenable number.

1309444 is a deficient number, since it is larger than the sum of its proper divisors (1003160).

1309444 is a wasteful number, since it uses less digits than its factorization.

1309444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014 (or 3012 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1309444 is about 1144.3093987205. The cubic root of 1309444 is about 109.4029358846.

It can be divided in two parts, 130944 and 4, that multiplied together give a triangular number (523776 = T₁₀₂₃).

The spelling of 1309444 in words is "one million, three hundred nine thousand, four hundred forty-four".