7968639 has 8 divisors (see below), whose sum is σ = 12142720. Its totient is φ = 4553496.

The previous prime is 7968617. The next prime is 7968641. The reversal of 7968639 is 9368697.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-7968639 is a prime.

It is a Duffinian number.

7968639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7968679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189709 + ... + 189750.

It is an arithmetic number, because the mean of its divisors is an integer number (1517840).

Almost surely, 2^7968639 is an apocalyptic number.

7968639 is a deficient number, since it is larger than the sum of its proper divisors (4174081).

7968639 is a wasteful number, since it uses less digits than its factorization.

7968639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379469.

The product of its digits is 489888, while the sum is 48.

The square root of 7968639 is about 2822.8777869401. The cubic root of 7968639 is about 199.7383160903.

The spelling of 7968639 in words is "seven million, nine hundred sixty-eight thousand, six hundred thirty-nine".