399755 has 8 divisors (see below), whose sum is σ = 508032. Its totient is φ = 300928.

The previous prime is 399739. The next prime is 399757. The reversal of 399755 is 557993.

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

It is a cyclic number.

It is not a de Polignac number, because 399755 - 2⁴ = 399739 is a prime.

It is a Duffinian number.

Its product of digits (42525) is a multiple of the sum of its prime divisors (4725).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 399755.

It is not an unprimeable number, because it can be changed into a prime (399757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2267 + ... + 2436.

It is an arithmetic number, because the mean of its divisors is an integer number (63504).

2³⁹⁹⁷⁵⁵ is an apocalyptic number.

399755 is a deficient number, since it is larger than the sum of its proper divisors (108277).

399755 is a wasteful number, since it uses less digits than its factorization.

399755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725.

The product of its digits is 42525, while the sum is 38.

The square root of 399755 is about 632.2618128592. The cubic root of 399755 is about 73.6655837718.

The spelling of 399755 in words is "three hundred ninety-nine thousand, seven hundred fifty-five".