1380809 has 4 divisors (see below), whose sum is σ = 1406916. Its totient is φ = 1354704.

The previous prime is 1380793. The next prime is 1380811. The reversal of 1380809 is 9080831.

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 1081600 + 299209 = 1040^2 + 547^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380809 - 2⁴ = 1380793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380889) 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, 12974 + ... + 13079.

It is an arithmetic number, because the mean of its divisors is an integer number (351729).

2^1380809 is an apocalyptic number.

It is an amenable number.

1380809 is a deficient number, since it is larger than the sum of its proper divisors (26107).

1380809 is an equidigital number, since it uses as much as digits as its factorization.

1380809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26106.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1380809 is about 1175.0782952638. The cubic root of 1380809 is about 111.3553796764.

The spelling of 1380809 in words is "one million, three hundred eighty thousand, eight hundred nine".