77343839 has 2 divisors, whose sum is σ = 77343840. Its totient is φ = 77343838.

The previous prime is 77343821. The next prime is 77343857. The reversal of 77343839 is 93834377.

It is a balanced prime because it is at equal distance from previous prime (77343821) and next prime (77343857).

It is a cyclic number.

It is not a de Polignac number, because 77343839 - 2¹⁶ = 77278303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77343839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77343869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38671919 + 38671920.

It is an arithmetic number, because the mean of its divisors is an integer number (38671920).

Almost surely, 2^77343839 is an apocalyptic number.

77343839 is a deficient number, since it is larger than the sum of its proper divisors (1).

77343839 is an equidigital number, since it uses as much as digits as its factorization.

77343839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 44.

The square root of 77343839 is about 8794.5346096311. The cubic root of 77343839 is about 426.0643936397.

The spelling of 77343839 in words is "seventy-seven million, three hundred forty-three thousand, eight hundred thirty-nine".