1318689 has 6 divisors (see below), whose sum is σ = 1904786. Its totient is φ = 879120.

The previous prime is 1318663. The next prime is 1318697. The reversal of 1318689 is 9868131.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 613089 = 840^2 + 783^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1318689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1318609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73252 + ... + 73269.

2^1318689 is an apocalyptic number.

It is an amenable number.

1318689 is a deficient number, since it is larger than the sum of its proper divisors (586097).

1318689 is a wasteful number, since it uses less digits than its factorization.

1318689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146527 (or 146524 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1318689 is about 1148.3418480575. The cubic root of 1318689 is about 109.6598029516.

The spelling of 1318689 in words is "one million, three hundred eighteen thousand, six hundred eighty-nine".