1395809 has 2 divisors, whose sum is σ = 1395810. Its totient is φ = 1395808.

The previous prime is 1395791. The next prime is 1395817. The reversal of 1395809 is 9085931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 107584 = 1135^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1395809 - 2⁸ = 1395553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1395829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697904 + 697905.

It is an arithmetic number, because the mean of its divisors is an integer number (697905).

2^1395809 is an apocalyptic number.

It is an amenable number.

1395809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1395809 is an equidigital number, since it uses as much as digits as its factorization.

1395809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1395809 is about 1181.4436084723. The cubic root of 1395809 is about 111.7571534574.

The spelling of 1395809 in words is "one million, three hundred ninety-five thousand, eight hundred nine".