399101 has 2 divisors, whose sum is σ = 399102. Its totient is φ = 399100.

The previous prime is 399097. The next prime is 399107. The reversal of 399101 is 101993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391876 + 7225 = 626^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 399101 - 2² = 399097 is a 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 (399107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199550 + 199551.

It is an arithmetic number, because the mean of its divisors is an integer number (199551).

2³⁹⁹¹⁰¹ is an apocalyptic number.

It is an amenable number.

399101 is a deficient number, since it is larger than the sum of its proper divisors (1).

399101 is an equidigital number, since it uses as much as digits as its factorization.

399101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 399101 is about 631.7444103433. The cubic root of 399101 is about 73.6253894958.

The spelling of 399101 in words is "three hundred ninety-nine thousand, one hundred one".