399935 has 4 divisors (see below), whose sum is σ = 479928. Its totient is φ = 319944.

The previous prime is 399913. The next prime is 399937. The reversal of 399935 is 539993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399935 - 2⁶ = 399871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39989 + ... + 39998.

It is an arithmetic number, because the mean of its divisors is an integer number (119982).

2³⁹⁹⁹³⁵ is an apocalyptic number.

399935 is a deficient number, since it is larger than the sum of its proper divisors (79993).

399935 is an equidigital number, since it uses as much as digits as its factorization.

399935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79992.

The product of its digits is 32805, while the sum is 38.

The square root of 399935 is about 632.4041429339. The cubic root of 399935 is about 73.6766387225.

The spelling of 399935 in words is "three hundred ninety-nine thousand, nine hundred thirty-five".