873638809 has 2 divisors, whose sum is σ = 873638810. Its totient is φ = 873638808.

The previous prime is 873638749. The next prime is 873638813. The reversal of 873638809 is 908836378.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 868598784 + 5040025 = 29472^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 873638809 - 2¹³ = 873630617 is a prime.

It is not a weakly prime, because it can be changed into another prime (873638819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436819404 + 436819405.

It is an arithmetic number, because the mean of its divisors is an integer number (436819405).

Almost surely, 2^873638809 is an apocalyptic number.

It is an amenable number.

873638809 is a deficient number, since it is larger than the sum of its proper divisors (1).

873638809 is an equidigital number, since it uses as much as digits as its factorization.

873638809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 873638809 is about 29557.3816330202. The cubic root of 873638809 is about 955.9693597464.

The spelling of 873638809 in words is "eight hundred seventy-three million, six hundred thirty-eight thousand, eight hundred nine".