399229 has 4 divisors (see below), whose sum is σ = 402876. Its totient is φ = 395584.

The previous prime is 399227. The next prime is 399239. The reversal of 399229 is 922993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 260100 = 373^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 399229 - 2¹ = 399227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399194 and 399203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1654 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (100719).

2³⁹⁹²²⁹ is an apocalyptic number.

It is an amenable number.

399229 is a deficient number, since it is larger than the sum of its proper divisors (3647).

399229 is a wasteful number, since it uses less digits than its factorization.

399229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646.

The product of its digits is 8748, while the sum is 34.

The square root of 399229 is about 631.8457090145. The cubic root of 399229 is about 73.6332597196.

The spelling of 399229 in words is "three hundred ninety-nine thousand, two hundred twenty-nine".