399543 has 8 divisors (see below), whose sum is σ = 538608. Its totient is φ = 263424.

The previous prime is 399541. The next prime is 399557. The reversal of 399543 is 345993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399543 - 2¹ = 399541 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 396 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (67326).

2³⁹⁹⁵⁴³ is an apocalyptic number.

399543 is a deficient number, since it is larger than the sum of its proper divisors (139065).

399543 is a wasteful number, since it uses less digits than its factorization.

399543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473.

The product of its digits is 14580, while the sum is 33.

The square root of 399543 is about 632.0941385585. The cubic root of 399543 is about 73.6525592399.

The spelling of 399543 in words is "three hundred ninety-nine thousand, five hundred forty-three".