84634409 has 2 divisors, whose sum is σ = 84634410. Its totient is φ = 84634408.

The previous prime is 84634399. The next prime is 84634463. The reversal of 84634409 is 90443648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 7546009 = 8780^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 84634409 - 2⁸ = 84634153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84634489) 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, 42317204 + 42317205.

It is an arithmetic number, because the mean of its divisors is an integer number (42317205).

Almost surely, 2^84634409 is an apocalyptic number.

It is an amenable number.

84634409 is a deficient number, since it is larger than the sum of its proper divisors (1).

84634409 is an equidigital number, since it uses as much as digits as its factorization.

84634409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 84634409 is about 9199.6961362862. The cubic root of 84634409 is about 439.0516921365.

The spelling of 84634409 in words is "eighty-four million, six hundred thirty-four thousand, four hundred nine".