77794393 has 2 divisors, whose sum is σ = 77794394. Its totient is φ = 77794392.

The previous prime is 77794361. The next prime is 77794399. The reversal of 77794393 is 39349777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46131264 + 31663129 = 6792^2 + 5627^2 .

It is an emirp because it is prime and its reverse (39349777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77794393 - 2⁵ = 77794361 is a prime.

It is not a weakly prime, because it can be changed into another prime (77794399) 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, 38897196 + 38897197.

It is an arithmetic number, because the mean of its divisors is an integer number (38897197).

Almost surely, 2^77794393 is an apocalyptic number.

It is an amenable number.

77794393 is a deficient number, since it is larger than the sum of its proper divisors (1).

77794393 is an equidigital number, since it uses as much as digits as its factorization.

77794393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000188, while the sum is 49.

The square root of 77794393 is about 8820.1129811358. The cubic root of 77794393 is about 426.8901153660.

It can be divided in two parts, 77794 and 393, that added together give a palindrome (78187).

The spelling of 77794393 in words is "seventy-seven million, seven hundred ninety-four thousand, three hundred ninety-three".