84392809 has 2 divisors, whose sum is σ = 84392810. Its totient is φ = 84392808.

The previous prime is 84392767. The next prime is 84392821. The reversal of 84392809 is 90829348.

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., 84272400 + 120409 = 9180^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 84392809 - 2²⁵ = 50838377 is a prime.

It is not a weakly prime, because it can be changed into another prime (84392839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42196404 + 42196405.

It is an arithmetic number, because the mean of its divisors is an integer number (42196405).

Almost surely, 2^84392809 is an apocalyptic number.

It is an amenable number.

84392809 is a deficient number, since it is larger than the sum of its proper divisors (1).

84392809 is an equidigital number, since it uses as much as digits as its factorization.

84392809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 84392809 is about 9186.5558834636. Note that the first 3 decimals coincide. The cubic root of 84392809 is about 438.6335171281.

The spelling of 84392809 in words is "eighty-four million, three hundred ninety-two thousand, eight hundred nine".