399430 has 16 divisors (see below), whose sum is σ = 732240. Its totient is φ = 156832.

The previous prime is 399409. The next prime is 399433. The reversal of 399430 is 34993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399433) by changing a digit.

399430 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 252 + ... + 928.

It is an arithmetic number, because the mean of its divisors is an integer number (45765).

2³⁹⁹⁴³⁰ is an apocalyptic number.

399430 is a deficient number, since it is larger than the sum of its proper divisors (332810).

399430 is a wasteful number, since it uses less digits than its factorization.

399430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 399430 is about 632.0047468176. The cubic root of 399430 is about 73.6456150362.

The spelling of 399430 in words is "three hundred ninety-nine thousand, four hundred thirty".