84947729 has 2 divisors, whose sum is σ = 84947730. Its totient is φ = 84947728.

The previous prime is 84947683. The next prime is 84947743. The reversal of 84947729 is 92774948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 14807104 = 8375^2 + 3848^2 .

It is a cyclic number.

It is not a de Polignac number, because 84947729 - 2¹² = 84943633 is a prime.

It is a super-2 number, since 2×84947729² = 14432233324514882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84947749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42473864 + 42473865.

It is an arithmetic number, because the mean of its divisors is an integer number (42473865).

Almost surely, 2^84947729 is an apocalyptic number.

It is an amenable number.

84947729 is a deficient number, since it is larger than the sum of its proper divisors (1).

84947729 is an equidigital number, since it uses as much as digits as its factorization.

84947729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 84947729 is about 9216.7092283526. The cubic root of 84947729 is about 439.5928206234.

The spelling of 84947729 in words is "eighty-four million, nine hundred forty-seven thousand, seven hundred twenty-nine".