390942571 has 2 divisors, whose sum is σ = 390942572. Its totient is φ = 390942570.

The previous prime is 390942553. The next prime is 390942631. The reversal of 390942571 is 175249093.

It is a weak prime.

It is an emirp because it is prime and its reverse (175249093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390942571 - 2⁹ = 390942059 is a prime.

It is not a weakly prime, because it can be changed into another prime (390942511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195471285 + 195471286.

It is an arithmetic number, because the mean of its divisors is an integer number (195471286).

Almost surely, 2^390942571 is an apocalyptic number.

390942571 is a deficient number, since it is larger than the sum of its proper divisors (1).

390942571 is an equidigital number, since it uses as much as digits as its factorization.

390942571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 390942571 is about 19772.2677252762. The cubic root of 390942571 is about 731.2024786514.

The spelling of 390942571 in words is "three hundred ninety million, nine hundred forty-two thousand, five hundred seventy-one".