393947077 has 2 divisors, whose sum is σ = 393947078. Its totient is φ = 393947076.

The previous prime is 393947051. The next prime is 393947093. The reversal of 393947077 is 770749393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386279716 + 7667361 = 19654^2 + 2769^2 .

It is an emirp because it is prime and its reverse (770749393) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393947077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 393947077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393947017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196973538 + 196973539.

It is an arithmetic number, because the mean of its divisors is an integer number (196973539).

Almost surely, 2^393947077 is an apocalyptic number.

It is an amenable number.

393947077 is a deficient number, since it is larger than the sum of its proper divisors (1).

393947077 is an equidigital number, since it uses as much as digits as its factorization.

393947077 is an evil number, because the sum of its binary digits is even.

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

The square root of 393947077 is about 19848.1000853986. The cubic root of 393947077 is about 733.0708674821.

The spelling of 393947077 in words is "three hundred ninety-three million, nine hundred forty-seven thousand, seventy-seven".