84634639 has 8 divisors (see below), whose sum is σ = 87410880. Its totient is φ = 81899136.

The previous prime is 84634637. The next prime is 84634643. The reversal of 84634639 is 93643648.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84634639 - 2¹ = 84634637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84634595 and 84634604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84634631) 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 in 7 ways as a sum of consecutive naturals, for example, 5934 + ... + 14299.

It is an arithmetic number, because the mean of its divisors is an integer number (10926360).

Almost surely, 2^84634639 is an apocalyptic number.

84634639 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

84634639 is a deficient number, since it is larger than the sum of its proper divisors (2776241).

84634639 is a wasteful number, since it uses less digits than its factorization.

84634639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20369.

The product of its digits is 373248, while the sum is 43.

The square root of 84634639 is about 9199.7086366906. The cubic root of 84634639 is about 439.0520898542.

Subtracting 84634639 from its reverse (93643648), we obtain a palindrome (9009009).

The spelling of 84634639 in words is "eighty-four million, six hundred thirty-four thousand, six hundred thirty-nine".