8404172729 has 2 divisors, whose sum is σ = 8404172730. Its totient is φ = 8404172728.

The previous prime is 8404172713. The next prime is 8404172747. The reversal of 8404172729 is 9272714048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5959068025 + 2445104704 = 77195^2 + 49448^2 .

It is a cyclic number.

It is not a de Polignac number, because 8404172729 - 2⁴ = 8404172713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8404172729.

It is not a weakly prime, because it can be changed into another prime (8404172779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4202086364 + 4202086365.

It is an arithmetic number, because the mean of its divisors is an integer number (4202086365).

Almost surely, 2^8404172729 is an apocalyptic number.

It is an amenable number.

8404172729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8404172729 is an equidigital number, since it uses as much as digits as its factorization.

8404172729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 8404172729 is about 91674.2751757547. The cubic root of 8404172729 is about 2033.1292568423.

The spelling of 8404172729 in words is "eight billion, four hundred four million, one hundred seventy-two thousand, seven hundred twenty-nine".