399213 has 6 divisors (see below), whose sum is σ = 576654. Its totient is φ = 266136.

The previous prime is 399197. The next prime is 399221. The reversal of 399213 is 312993.

It can be written as a sum of positive squares in only one way, i.e., 393129 + 6084 = 627^2 + 78^2 .

It is not a de Polignac number, because 399213 - 2⁴ = 399197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399263) 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 in 5 ways as a sum of consecutive naturals, for example, 22170 + ... + 22187.

It is an arithmetic number, because the mean of its divisors is an integer number (96109).

2³⁹⁹²¹³ is an apocalyptic number.

It is an amenable number.

399213 is a deficient number, since it is larger than the sum of its proper divisors (177441).

399213 is a wasteful number, since it uses less digits than its factorization.

399213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44363 (or 44360 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 399213 is about 631.8330475687. The cubic root of 399213 is about 73.6322760336.

It can be divided in two parts, 3992 and 13, that added together give a triangular number (4005 = T₈₉).

The spelling of 399213 in words is "three hundred ninety-nine thousand, two hundred thirteen".