77973839 has 2 divisors, whose sum is σ = 77973840. Its totient is φ = 77973838.

The previous prime is 77973827. The next prime is 77973859. The reversal of 77973839 is 93837977.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77973839 - 2⁴ = 77973823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77973859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38986919 + 38986920.

It is an arithmetic number, because the mean of its divisors is an integer number (38986920).

Almost surely, 2^77973839 is an apocalyptic number.

77973839 is a deficient number, since it is larger than the sum of its proper divisors (1).

77973839 is an equidigital number, since it uses as much as digits as its factorization.

77973839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000376, while the sum is 53.

The square root of 77973839 is about 8830.2796671453. The cubic root of 77973839 is about 427.2180948695.

The spelling of 77973839 in words is "seventy-seven million, nine hundred seventy-three thousand, eight hundred thirty-nine".