399271 has 2 divisors, whose sum is σ = 399272. Its totient is φ = 399270.

The previous prime is 399263. The next prime is 399277. The reversal of 399271 is 172993.

It is a strong prime.

It is an emirp because it is prime and its reverse (172993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399271 - 2³ = 399263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199635 + 199636.

It is an arithmetic number, because the mean of its divisors is an integer number (199636).

2³⁹⁹²⁷¹ is an apocalyptic number.

399271 is a deficient number, since it is larger than the sum of its proper divisors (1).

399271 is an equidigital number, since it uses as much as digits as its factorization.

399271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 399271 is about 631.8789441024. The cubic root of 399271 is about 73.6358417702.

The spelling of 399271 in words is "three hundred ninety-nine thousand, two hundred seventy-one".