2939639 has 2 divisors, whose sum is σ = 2939640. Its totient is φ = 2939638.

The previous prime is 2939633. The next prime is 2939641. The reversal of 2939639 is 9369392.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2939639 is a prime.

Together with 2939641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2939596 and 2939605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2939633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1469819 + 1469820.

It is an arithmetic number, because the mean of its divisors is an integer number (1469820).

2^2939639 is an apocalyptic number.

2939639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2939639 is an equidigital number, since it uses as much as digits as its factorization.

2939639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 41.

The square root of 2939639 is about 1714.5375469788. The cubic root of 2939639 is about 143.2511114274.

The spelling of 2939639 in words is "two million, nine hundred thirty-nine thousand, six hundred thirty-nine".