77390393 has 2 divisors, whose sum is σ = 77390394. Its totient is φ = 77390392.

The previous prime is 77390333. The next prime is 77390407. The reversal of 77390393 is 39309377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73753744 + 3636649 = 8588^2 + 1907^2 .

It is a cyclic number.

It is not a de Polignac number, because 77390393 - 2¹⁰ = 77389369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77390393.

It is not a weakly prime, because it can be changed into another prime (77390303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38695196 + 38695197.

It is an arithmetic number, because the mean of its divisors is an integer number (38695197).

Almost surely, 2^77390393 is an apocalyptic number.

It is an amenable number.

77390393 is a deficient number, since it is larger than the sum of its proper divisors (1).

77390393 is an equidigital number, since it uses as much as digits as its factorization.

77390393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107163, while the sum is 41.

The square root of 77390393 is about 8797.1809689241. The cubic root of 77390393 is about 426.1498605786.

The spelling of 77390393 in words is "seventy-seven million, three hundred ninety thousand, three hundred ninety-three".