399071 has 2 divisors, whose sum is σ = 399072. Its totient is φ = 399070.

The previous prime is 399067. The next prime is 399079. The reversal of 399071 is 170993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399071 - 2² = 399067 is a prime.

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 (399079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199535 + 199536.

It is an arithmetic number, because the mean of its divisors is an integer number (199536).

2³⁹⁹⁰⁷¹ is an apocalyptic number.

399071 is a deficient number, since it is larger than the sum of its proper divisors (1).

399071 is an equidigital number, since it uses as much as digits as its factorization.

399071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 399071 is about 631.7206661175. The cubic root of 399071 is about 73.6235446687.

The spelling of 399071 in words is "three hundred ninety-nine thousand, seventy-one".