399156 has 48 divisors (see below), whose sum is σ = 1021440. Its totient is φ = 120960.

The previous prime is 399151. The next prime is 399163. The reversal of 399156 is 651993.

399156 = T₁₂₈ + T₁₂₉ + ... + T₁₆₄.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399151) by changing a digit.

399156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10770 + ... + 10806.

It is an arithmetic number, because the mean of its divisors is an integer number (21280).

2³⁹⁹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (510720).

399156 is an abundant number, since it is smaller than the sum of its proper divisors (622284).

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

399156 is a wasteful number, since it uses less digits than its factorization.

399156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 102 counting only the distinct ones).

The product of its digits is 7290, while the sum is 33.

The square root of 399156 is about 631.7879391062. The cubic root of 399156 is about 73.6287714388.

It can be divided in two parts, 399 and 156, that added together give a palindrome (555).

The spelling of 399156 in words is "three hundred ninety-nine thousand, one hundred fifty-six".