77942429 has 2 divisors, whose sum is σ = 77942430. Its totient is φ = 77942428.

The previous prime is 77942393. The next prime is 77942437. The reversal of 77942429 is 92424977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 26030404 = 7205^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 77942429 - 2¹⁶ = 77876893 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77942429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77942329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38971214 + 38971215.

It is an arithmetic number, because the mean of its divisors is an integer number (38971215).

Almost surely, 2^77942429 is an apocalyptic number.

It is an amenable number.

77942429 is a deficient number, since it is larger than the sum of its proper divisors (1).

77942429 is an equidigital number, since it uses as much as digits as its factorization.

77942429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 77942429 is about 8828.5009486322. The cubic root of 77942429 is about 427.1607221114.

The spelling of 77942429 in words is "seventy-seven million, nine hundred forty-two thousand, four hundred twenty-nine".