978239 has 2 divisors, whose sum is σ = 978240. Its totient is φ = 978238.

The previous prime is 978233. The next prime is 978269. The reversal of 978239 is 932879.

It is a weak prime.

It is an emirp because it is prime and its reverse (932879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978239 - 2⁴ = 978223 is a prime.

It is a super-2 number, since 2×978239² = 1913903082242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489119 + 489120.

It is an arithmetic number, because the mean of its divisors is an integer number (489120).

2⁹⁷⁸²³⁹ is an apocalyptic number.

978239 is a deficient number, since it is larger than the sum of its proper divisors (1).

978239 is an equidigital number, since it uses as much as digits as its factorization.

978239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 978239 is about 989.0596544193. The cubic root of 978239 is about 99.2693072181.

The spelling of 978239 in words is "nine hundred seventy-eight thousand, two hundred thirty-nine".