77868943 has 2 divisors, whose sum is σ = 77868944. Its totient is φ = 77868942.

The previous prime is 77868919. The next prime is 77868949. The reversal of 77868943 is 34986877.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34986877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77868943 - 2⁵ = 77868911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77868949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38934471 + 38934472.

It is an arithmetic number, because the mean of its divisors is an integer number (38934472).

Almost surely, 2^77868943 is an apocalyptic number.

77868943 is a deficient number, since it is larger than the sum of its proper divisors (1).

77868943 is an equidigital number, since it uses as much as digits as its factorization.

77868943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 52.

The square root of 77868943 is about 8824.3381054898. The cubic root of 77868943 is about 427.0264340923.

The spelling of 77868943 in words is "seventy-seven million, eight hundred sixty-eight thousand, nine hundred forty-three".