4999639 has 2 divisors, whose sum is σ = 4999640. Its totient is φ = 4999638.

The previous prime is 4999637. The next prime is 4999651. The reversal of 4999639 is 9369994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4999639 - 2¹ = 4999637 is a prime.

Together with 4999637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4999592 and 4999601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4999633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499819 + 2499820.

It is an arithmetic number, because the mean of its divisors is an integer number (2499820).

Almost surely, 2^4999639 is an apocalyptic number.

4999639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4999639 is an equidigital number, since it uses as much as digits as its factorization.

4999639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 49.

The square root of 4999639 is about 2235.9872539887. The cubic root of 4999639 is about 170.9934792265.

The spelling of 4999639 in words is "four million, nine hundred ninety-nine thousand, six hundred thirty-nine".