78325939 has 2 divisors, whose sum is σ = 78325940. Its totient is φ = 78325938.

The previous prime is 78325937. The next prime is 78325957. The reversal of 78325939 is 93952387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78325939 - 2¹ = 78325937 is a prime.

It is a super-2 number, since 2×78325939² = 12269905440463442, which contains 22 as substring.

Together with 78325937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78325931) 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, 39162969 + 39162970.

It is an arithmetic number, because the mean of its divisors is an integer number (39162970).

Almost surely, 2^78325939 is an apocalyptic number.

78325939 is a deficient number, since it is larger than the sum of its proper divisors (1).

78325939 is an equidigital number, since it uses as much as digits as its factorization.

78325939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 78325939 is about 8850.1942916526. The cubic root of 78325939 is about 427.8601804764.

The spelling of 78325939 in words is "seventy-eight million, three hundred twenty-five thousand, nine hundred thirty-nine".