399006 has 24 divisors (see below), whose sum is σ = 897624. Its totient is φ = 132840.

The previous prime is 398989. The next prime is 399023. The reversal of 399006 is 600993.

It is an interprime number because it is at equal distance from previous prime (398989) and next prime (399023).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (37401).

2³⁹⁹⁰⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (448812).

399006 is an abundant number, since it is smaller than the sum of its proper divisors (498618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399006 is an equidigital number, since it uses as much as digits as its factorization.

399006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 826 counting only the distinct ones).

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

The square root of 399006 is about 631.6692172332. The cubic root of 399006 is about 73.6195472261.

Adding to 399006 its reverse (600993), we get a palindrome (999999).

It can be divided in two parts, 39 and 9006, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 399006 in words is "three hundred ninety-nine thousand, six".