399231 has 12 divisors (see below), whose sum is σ = 659152. Its totient is φ = 228096.

The previous prime is 399227. The next prime is 399239. The reversal of 399231 is 132993.

399231 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 399231 - 2² = 399227 is a prime.

It is a super-2 number, since 2×399231² = 318770782722, which contains 22 as substring.

It is a Duffinian number.

399231 is strictly pandigital in base 7.

399231 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 399195 and 399204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3106 + ... + 3231.

2³⁹⁹²³¹ is an apocalyptic number.

399231 is a deficient number, since it is larger than the sum of its proper divisors (259921).

399231 is a wasteful number, since it uses less digits than its factorization.

399231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350 (or 6347 counting only the distinct ones).

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

The square root of 399231 is about 631.8472916773. The cubic root of 399231 is about 73.6333826785.

Adding to 399231 its product of digits (1458), we get a square (400689 = 633²).

It can be divided in two parts, 399 and 231, that added together give a triangular number (630 = T₃₅).

The spelling of 399231 in words is "three hundred ninety-nine thousand, two hundred thirty-one".