8978239 has 2 divisors, whose sum is σ = 8978240. Its totient is φ = 8978238.

The previous prime is 8978237. The next prime is 8978243. The reversal of 8978239 is 9328798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8978239 - 2¹ = 8978237 is a prime.

It is a super-2 number, since 2×8978239² = 161217551082242, which contains 22 as substring.

Together with 8978237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8978237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489119 + 4489120.

It is an arithmetic number, because the mean of its divisors is an integer number (4489120).

Almost surely, 2^8978239 is an apocalyptic number.

8978239 is a deficient number, since it is larger than the sum of its proper divisors (1).

8978239 is an equidigital number, since it uses as much as digits as its factorization.

8978239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 8978239 is about 2996.3709716923. The cubic root of 8978239 is about 207.8405999540.

The spelling of 8978239 in words is "eight million, nine hundred seventy-eight thousand, two hundred thirty-nine".