1318909 has 4 divisors (see below), whose sum is σ = 1332604. Its totient is φ = 1305216.

The previous prime is 1318903. The next prime is 1318913. The reversal of 1318909 is 9098131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 324900 + 994009 = 570^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318909 - 2³ = 1318901 is a prime.

It is a Duffinian number.

1318909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6702 + ... + 6895.

It is an arithmetic number, because the mean of its divisors is an integer number (333151).

2^1318909 is an apocalyptic number.

It is an amenable number.

1318909 is a deficient number, since it is larger than the sum of its proper divisors (13695).

1318909 is an equidigital number, since it uses as much as digits as its factorization.

1318909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13694.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1318909 is about 1148.4376343537. The cubic root of 1318909 is about 109.6659008804.

The spelling of 1318909 in words is "one million, three hundred eighteen thousand, nine hundred nine".