84040709 has 2 divisors, whose sum is σ = 84040710. Its totient is φ = 84040708.

The previous prime is 84040657. The next prime is 84040729. The reversal of 84040709 is 90704048.

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., 79156609 + 4884100 = 8897^2 + 2210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84040709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84040729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42020354 + 42020355.

It is an arithmetic number, because the mean of its divisors is an integer number (42020355).

Almost surely, 2^84040709 is an apocalyptic number.

It is an amenable number.

84040709 is a deficient number, since it is larger than the sum of its proper divisors (1).

84040709 is an equidigital number, since it uses as much as digits as its factorization.

84040709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 84040709 is about 9167.3719789261. The cubic root of 84040709 is about 438.0226509140.

The spelling of 84040709 in words is "eighty-four million, forty thousand, seven hundred nine".