399385 has 8 divisors (see below), whose sum is σ = 547776. Its totient is φ = 273840.

The previous prime is 399379. The next prime is 399389. The reversal of 399385 is 583993.

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

It is not a de Polignac number, because 399385 - 2⁵ = 399353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5671 + ... + 5740.

It is an arithmetic number, because the mean of its divisors is an integer number (68472).

2³⁹⁹³⁸⁵ is an apocalyptic number.

399385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

399385 is a deficient number, since it is larger than the sum of its proper divisors (148391).

399385 is a wasteful number, since it uses less digits than its factorization.

399385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11423.

The product of its digits is 29160, while the sum is 37.

The square root of 399385 is about 631.9691448164. The cubic root of 399385 is about 73.6428492807.

It can be divided in two parts, 399 and 385, that added together give a square (784 = 28²).

The spelling of 399385 in words is "three hundred ninety-nine thousand, three hundred eighty-five".