77939243 has 2 divisors, whose sum is σ = 77939244. Its totient is φ = 77939242.

The previous prime is 77939231. The next prime is 77939287. The reversal of 77939243 is 34293977.

It is an a-pointer prime, because the next prime (77939287) can be obtained adding 77939243 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77939243 - 2¹⁶ = 77873707 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77939194 and 77939203.

It is not a weakly prime, because it can be changed into another prime (77939293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38969621 + 38969622.

It is an arithmetic number, because the mean of its divisors is an integer number (38969622).

Almost surely, 2^77939243 is an apocalyptic number.

77939243 is a deficient number, since it is larger than the sum of its proper divisors (1).

77939243 is an equidigital number, since it uses as much as digits as its factorization.

77939243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 44.

The square root of 77939243 is about 8828.3205084546. The cubic root of 77939243 is about 427.1549017787.

The spelling of 77939243 in words is "seventy-seven million, nine hundred thirty-nine thousand, two hundred forty-three".