77945443 has 2 divisors, whose sum is σ = 77945444. Its totient is φ = 77945442.

The previous prime is 77945401. The next prime is 77945447. The reversal of 77945443 is 34454977.

It is a strong prime.

It is an emirp because it is prime and its reverse (34454977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77945443 - 2⁹ = 77944931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77945443.

It is not a weakly prime, because it can be changed into another prime (77945447) 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, 38972721 + 38972722.

It is an arithmetic number, because the mean of its divisors is an integer number (38972722).

Almost surely, 2^77945443 is an apocalyptic number.

77945443 is a deficient number, since it is larger than the sum of its proper divisors (1).

77945443 is an equidigital number, since it uses as much as digits as its factorization.

77945443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The square root of 77945443 is about 8828.6716441376. The cubic root of 77945443 is about 427.1662280806.

The spelling of 77945443 in words is "seventy-seven million, nine hundred forty-five thousand, four hundred forty-three".