78535939 has 2 divisors, whose sum is σ = 78535940. Its totient is φ = 78535938.

The previous prime is 78535901. The next prime is 78535943. The reversal of 78535939 is 93953587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78535939 - 2¹³ = 78527747 is a prime.

It is a super-2 number, since 2×78535939² = 12335787429223442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78535892 and 78535901.

It is not a weakly prime, because it can be changed into another prime (78535979) 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, 39267969 + 39267970.

It is an arithmetic number, because the mean of its divisors is an integer number (39267970).

Almost surely, 2^78535939 is an apocalyptic number.

78535939 is a deficient number, since it is larger than the sum of its proper divisors (1).

78535939 is an equidigital number, since it uses as much as digits as its factorization.

78535939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 49.

The square root of 78535939 is about 8862.0504963581. The cubic root of 78535939 is about 428.2422184866.

The spelling of 78535939 in words is "seventy-eight million, five hundred thirty-five thousand, nine hundred thirty-nine".