1340909 has 4 divisors (see below), whose sum is σ = 1419804. Its totient is φ = 1262016.

The previous prime is 1340903. The next prime is 1340929. The reversal of 1340909 is 9090431.

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 2 ways, for example, as 770884 + 570025 = 878^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340909 - 2⁸ = 1340653 is a prime.

It is a Duffinian number.

1340909 is a modest number, since divided by 909 gives 134 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39422 + ... + 39455.

It is an arithmetic number, because the mean of its divisors is an integer number (354951).

2^1340909 is an apocalyptic number.

It is an amenable number.

1340909 is a deficient number, since it is larger than the sum of its proper divisors (78895).

1340909 is an equidigital number, since it uses as much as digits as its factorization.

1340909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78894.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1340909 is about 1157.9762519154. The cubic root of 1340909 is about 110.2723005813.

The spelling of 1340909 in words is "one million, three hundred forty thousand, nine hundred nine".