399490571 has 2 divisors, whose sum is σ = 399490572. Its totient is φ = 399490570.

The previous prime is 399490549. The next prime is 399490577. The reversal of 399490571 is 175094993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399490571 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399490577) 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, 199745285 + 199745286.

It is an arithmetic number, because the mean of its divisors is an integer number (199745286).

Almost surely, 2^399490571 is an apocalyptic number.

399490571 is a deficient number, since it is larger than the sum of its proper divisors (1).

399490571 is an equidigital number, since it uses as much as digits as its factorization.

399490571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 399490571 is about 19987.2602174485. The cubic root of 399490571 is about 736.4933747659.

The spelling of 399490571 in words is "three hundred ninety-nine million, four hundred ninety thousand, five hundred seventy-one".