399941 has 2 divisors, whose sum is σ = 399942. Its totient is φ = 399940.

The previous prime is 399937. The next prime is 399953. The reversal of 399941 is 149993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306916 + 93025 = 554^2 + 305^2 .

It is an emirp because it is prime and its reverse (149993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399941 - 2² = 399937 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199970 + 199971.

It is an arithmetic number, because the mean of its divisors is an integer number (199971).

2³⁹⁹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

399941 is a deficient number, since it is larger than the sum of its proper divisors (1).

399941 is an equidigital number, since it uses as much as digits as its factorization.

399941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 399941 is about 632.4088867181. The cubic root of 399941 is about 73.6770071637.

Subtracting from 399941 its product of digits (8748), we obtain a palindrome (391193).

The spelling of 399941 in words is "three hundred ninety-nine thousand, nine hundred forty-one".