399135 has 32 divisors (see below), whose sum is σ = 725760. Its totient is φ = 185600.

The previous prime is 399131. The next prime is 399137. The reversal of 399135 is 531993.

It is not a de Polignac number, because 399135 - 2² = 399131 is a prime.

It is an Ulam number.

399135 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399131) 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 31 ways as a sum of consecutive naturals, for example, 6736 + ... + 6794.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2³⁹⁹¹³⁵ is an apocalyptic number.

399135 is a deficient number, since it is larger than the sum of its proper divisors (326625).

399135 is a wasteful number, since it uses less digits than its factorization.

399135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119.

The product of its digits is 3645, while the sum is 30.

The square root of 399135 is about 631.7713193870. The cubic root of 399135 is about 73.6274801881.

The spelling of 399135 in words is "three hundred ninety-nine thousand, one hundred thirty-five".