84070309 has 2 divisors, whose sum is σ = 84070310. Its totient is φ = 84070308.

The previous prime is 84070303. The next prime is 84070367. The reversal of 84070309 is 90307048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47128225 + 36942084 = 6865^2 + 6078^2 .

It is a cyclic number.

It is not a de Polignac number, because 84070309 - 2⁵ = 84070277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84070303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42035154 + 42035155.

It is an arithmetic number, because the mean of its divisors is an integer number (42035155).

Almost surely, 2^84070309 is an apocalyptic number.

It is an amenable number.

84070309 is a deficient number, since it is larger than the sum of its proper divisors (1).

84070309 is an equidigital number, since it uses as much as digits as its factorization.

84070309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 84070309 is about 9168.9862580331. The cubic root of 84070309 is about 438.0740702350.

The spelling of 84070309 in words is "eighty-four million, seventy thousand, three hundred nine".