77922389 has 2 divisors, whose sum is σ = 77922390. Its totient is φ = 77922388.

The previous prime is 77922379. The next prime is 77922431. The reversal of 77922389 is 98322977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66699889 + 11222500 = 8167^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 77922389 - 2⁸ = 77922133 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77922329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961194 + 38961195.

It is an arithmetic number, because the mean of its divisors is an integer number (38961195).

Almost surely, 2^77922389 is an apocalyptic number.

It is an amenable number.

77922389 is a deficient number, since it is larger than the sum of its proper divisors (1).

77922389 is an equidigital number, since it uses as much as digits as its factorization.

77922389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 77922389 is about 8827.3659151527. The cubic root of 77922389 is about 427.1241094700.

The spelling of 77922389 in words is "seventy-seven million, nine hundred twenty-two thousand, three hundred eighty-nine".