1309684 has 6 divisors (see below), whose sum is σ = 2291954. Its totient is φ = 654840.

The previous prime is 1309673. The next prime is 1309691. The reversal of 1309684 is 4869031.

1309684 = 222² + 223² + ... + 245².

It can be written as a sum of positive squares in only one way, i.e., 685584 + 624100 = 828^2 + 790^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163707 + ... + 163714.

2^1309684 is an apocalyptic number.

It is an amenable number.

1309684 is a deficient number, since it is larger than the sum of its proper divisors (982270).

1309684 is a wasteful number, since it uses less digits than its factorization.

1309684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327425 (or 327423 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1309684 is about 1144.4142606591. The cubic root of 1309684 is about 109.4096194084.

The spelling of 1309684 in words is "one million, three hundred nine thousand, six hundred eighty-four".