387779393 has 2 divisors, whose sum is σ = 387779394. Its totient is φ = 387779392.

The previous prime is 387779389. The next prime is 387779407. The reversal of 387779393 is 393977783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367412224 + 20367169 = 19168^2 + 4513^2 .

It is a cyclic number.

It is not a de Polignac number, because 387779393 - 2² = 387779389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (387779593) 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, 193889696 + 193889697.

It is an arithmetic number, because the mean of its divisors is an integer number (193889697).

Almost surely, 2^387779393 is an apocalyptic number.

It is an amenable number.

387779393 is a deficient number, since it is larger than the sum of its proper divisors (1).

387779393 is an equidigital number, since it uses as much as digits as its factorization.

387779393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6001128, while the sum is 56.

The square root of 387779393 is about 19692.1149956017. The cubic root of 387779393 is about 729.2250442527.

The spelling of 387779393 in words is "three hundred eighty-seven million, seven hundred seventy-nine thousand, three hundred ninety-three".