947839 has 4 divisors (see below), whose sum is σ = 950400. Its totient is φ = 945280.

The previous prime is 947833. The next prime is 947851. The reversal of 947839 is 938749.

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 947839 - 2⁷ = 947711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607 + ... + 1504.

It is an arithmetic number, because the mean of its divisors is an integer number (237600).

2⁹⁴⁷⁸³⁹ is an apocalyptic number.

947839 is a deficient number, since it is larger than the sum of its proper divisors (2561).

947839 is a wasteful number, since it uses less digits than its factorization.

947839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

The product of its digits is 54432, while the sum is 40.

The square root of 947839 is about 973.5702337274. The cubic root of 947839 is about 98.2301615076.

The spelling of 947839 in words is "nine hundred forty-seven thousand, eight hundred thirty-nine".