77442943 has 2 divisors, whose sum is σ = 77442944. Its totient is φ = 77442942.

The previous prime is 77442941. The next prime is 77442979. The reversal of 77442943 is 34924477.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77442943 - 2¹ = 77442941 is a prime.

Together with 77442941, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 77442896 and 77442905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77442941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38721471 + 38721472.

It is an arithmetic number, because the mean of its divisors is an integer number (38721472).

Almost surely, 2^77442943 is an apocalyptic number.

77442943 is a deficient number, since it is larger than the sum of its proper divisors (1).

77442943 is an equidigital number, since it uses as much as digits as its factorization.

77442943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 40.

The square root of 77442943 is about 8800.1672143204. The cubic root of 77442943 is about 426.2462942033.

The spelling of 77442943 in words is "seventy-seven million, four hundred forty-two thousand, nine hundred forty-three".