747839 has 2 divisors, whose sum is σ = 747840. Its totient is φ = 747838.

The previous prime is 747833. The next prime is 747841. The reversal of 747839 is 938747.

It is a strong prime.

It is an emirp because it is prime and its reverse (938747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 747839 - 2⁸ = 747583 is a prime.

Together with 747841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (747833) 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 as a sum of consecutive naturals, namely, 373919 + 373920.

It is an arithmetic number, because the mean of its divisors is an integer number (373920).

2⁷⁴⁷⁸³⁹ is an apocalyptic number.

747839 is a deficient number, since it is larger than the sum of its proper divisors (1).

747839 is an equidigital number, since it uses as much as digits as its factorization.

747839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 747839 is about 864.7768498289. The cubic root of 747839 is about 90.7686835278.

The spelling of 747839 in words is "seven hundred forty-seven thousand, eight hundred thirty-nine".