399546 has 48 divisors (see below), whose sum is σ = 1039680. Its totient is φ = 113400.

The previous prime is 399541. The next prime is 399557. The reversal of 399546 is 645993.

It is a super-2 number, since 2×399546² = 319274012232, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3 + 9 + 5⁷ + 9⁵ + 4⁹ + 6³ .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 399546.

It is not an unprimeable number, because it can be changed into a prime (399541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571 + ... + 2721.

It is an arithmetic number, because the mean of its divisors is an integer number (21660).

2³⁹⁹⁵⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519840).

399546 is an abundant number, since it is smaller than the sum of its proper divisors (640134).

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

399546 is a wasteful number, since it uses less digits than its factorization.

399546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 163 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 399546 is about 632.0965116183. The cubic root of 399546 is about 73.6527435815.

The spelling of 399546 in words is "three hundred ninety-nine thousand, five hundred forty-six".