84639329 has 2 divisors, whose sum is σ = 84639330. Its totient is φ = 84639328.

The previous prime is 84639253. The next prime is 84639337. The reversal of 84639329 is 92393648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 33373729 = 7160^2 + 5777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84639329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84639329.

It is not a weakly prime, because it can be changed into another prime (84639389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42319664 + 42319665.

It is an arithmetic number, because the mean of its divisors is an integer number (42319665).

Almost surely, 2^84639329 is an apocalyptic number.

It is an amenable number.

84639329 is a deficient number, since it is larger than the sum of its proper divisors (1).

84639329 is an equidigital number, since it uses as much as digits as its factorization.

84639329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 84639329 is about 9199.9635325364. The cubic root of 84639329 is about 439.0601996789.

The spelling of 84639329 in words is "eighty-four million, six hundred thirty-nine thousand, three hundred twenty-nine".