835400809 has 2 divisors, whose sum is σ = 835400810. Its totient is φ = 835400808.

The previous prime is 835400801. The next prime is 835400849. The reversal of 835400809 is 908004538.

835400809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831053584 + 4347225 = 28828^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 835400809 - 2³ = 835400801 is a prime.

It is not a weakly prime, because it can be changed into another prime (835400801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417700404 + 417700405.

It is an arithmetic number, because the mean of its divisors is an integer number (417700405).

Almost surely, 2^835400809 is an apocalyptic number.

It is an amenable number.

835400809 is a deficient number, since it is larger than the sum of its proper divisors (1).

835400809 is an equidigital number, since it uses as much as digits as its factorization.

835400809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 835400809 is about 28903.3010052485. The cubic root of 835400809 is about 941.8136138164.

The spelling of 835400809 in words is "eight hundred thirty-five million, four hundred thousand, eight hundred nine".