393242777 has 2 divisors, whose sum is σ = 393242778. Its totient is φ = 393242776.

The previous prime is 393242741. The next prime is 393242779. The reversal of 393242777 is 777242393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389036176 + 4206601 = 19724^2 + 2051^2 .

It is a cyclic number.

It is not a de Polignac number, because 393242777 - 2¹⁰ = 393241753 is a prime.

Together with 393242779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (393242779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196621388 + 196621389.

It is an arithmetic number, because the mean of its divisors is an integer number (196621389).

Almost surely, 2^393242777 is an apocalyptic number.

It is an amenable number.

393242777 is a deficient number, since it is larger than the sum of its proper divisors (1).

393242777 is an equidigital number, since it uses as much as digits as its factorization.

393242777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 44.

The square root of 393242777 is about 19830.3498960558. The cubic root of 393242777 is about 732.6337446382.

The spelling of 393242777 in words is "three hundred ninety-three million, two hundred forty-two thousand, seven hundred seventy-seven".