742839 has 4 divisors (see below), whose sum is σ = 990456. Its totient is φ = 495224.

The previous prime is 742817. The next prime is 742891. The reversal of 742839 is 938247.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 742839 - 2⁷ = 742711 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742439) 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 3 ways as a sum of consecutive naturals, for example, 123804 + ... + 123809.

It is an arithmetic number, because the mean of its divisors is an integer number (247614).

2⁷⁴²⁸³⁹ is an apocalyptic number.

742839 is a deficient number, since it is larger than the sum of its proper divisors (247617).

742839 is a wasteful number, since it uses less digits than its factorization.

742839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247616.

The product of its digits is 12096, while the sum is 33.

The square root of 742839 is about 861.8810822846. The cubic root of 742839 is about 90.5659399575.

The spelling of 742839 in words is "seven hundred forty-two thousand, eight hundred thirty-nine".