399535 has 4 divisors (see below), whose sum is σ = 479448. Its totient is φ = 319624.

The previous prime is 399527. The next prime is 399541. The reversal of 399535 is 535993.

It is a happy number.

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 399535 - 2³ = 399527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39949 + ... + 39958.

It is an arithmetic number, because the mean of its divisors is an integer number (119862).

2³⁹⁹⁵³⁵ is an apocalyptic number.

399535 is a deficient number, since it is larger than the sum of its proper divisors (79913).

399535 is an equidigital number, since it uses as much as digits as its factorization.

399535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79912.

The product of its digits is 18225, while the sum is 34.

The square root of 399535 is about 632.0878103555. The cubic root of 399535 is about 73.6520676579.

The spelling of 399535 in words is "three hundred ninety-nine thousand, five hundred thirty-five".