393947051 has 2 divisors, whose sum is σ = 393947052. Its totient is φ = 393947050.

The previous prime is 393947033. The next prime is 393947077. The reversal of 393947051 is 150749393.

It is a weak prime.

It is an emirp because it is prime and its reverse (150749393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 393947051 - 2¹⁰ = 393946027 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (393947011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196973525 + 196973526.

It is an arithmetic number, because the mean of its divisors is an integer number (196973526).

Almost surely, 2^393947051 is an apocalyptic number.

393947051 is a deficient number, since it is larger than the sum of its proper divisors (1).

393947051 is an equidigital number, since it uses as much as digits as its factorization.

393947051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 393947051 is about 19848.0994304241. The cubic root of 393947051 is about 733.0708513549.

The spelling of 393947051 in words is "three hundred ninety-three million, nine hundred forty-seven thousand, fifty-one".