83684729 has 2 divisors, whose sum is σ = 83684730. Its totient is φ = 83684728.

The previous prime is 83684701. The next prime is 83684743. The reversal of 83684729 is 92748638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50737129 + 32947600 = 7123^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 83684729 - 2²⁴ = 66907513 is a prime.

It is not a weakly prime, because it can be changed into another prime (83684129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41842364 + 41842365.

It is an arithmetic number, because the mean of its divisors is an integer number (41842365).

Almost surely, 2^83684729 is an apocalyptic number.

It is an amenable number.

83684729 is a deficient number, since it is larger than the sum of its proper divisors (1).

83684729 is an equidigital number, since it uses as much as digits as its factorization.

83684729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 83684729 is about 9147.9357780868. The cubic root of 83684729 is about 437.4033162135.

The spelling of 83684729 in words is "eighty-three million, six hundred eighty-four thousand, seven hundred twenty-nine".