390857471 has 2 divisors, whose sum is σ = 390857472. Its totient is φ = 390857470.

The previous prime is 390857461. The next prime is 390857491. The reversal of 390857471 is 174758093.

It is a weak prime.

It is an emirp because it is prime and its reverse (174758093) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390857471 is a prime.

It is a super-3 number, since 3×390857471³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390857461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195428735 + 195428736.

It is an arithmetic number, because the mean of its divisors is an integer number (195428736).

Almost surely, 2^390857471 is an apocalyptic number.

390857471 is a deficient number, since it is larger than the sum of its proper divisors (1).

390857471 is an equidigital number, since it uses as much as digits as its factorization.

390857471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 390857471 is about 19770.1156041132. The cubic root of 390857471 is about 731.1494189856.

The spelling of 390857471 in words is "three hundred ninety million, eight hundred fifty-seven thousand, four hundred seventy-one".