355999 has 4 divisors (see below), whose sum is σ = 406864. Its totient is φ = 305136.

The previous prime is 355969. The next prime is 356023. The reversal of 355999 is 999553.

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 355999 - 2⁵ = 355967 is a prime.

It is a Duffinian number.

355999 is a modest number, since divided by 999 gives 355 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25422 + ... + 25435.

It is an arithmetic number, because the mean of its divisors is an integer number (101716).

2³⁵⁵⁹⁹⁹ is an apocalyptic number.

355999 is a deficient number, since it is larger than the sum of its proper divisors (50865).

355999 is an equidigital number, since it uses as much as digits as its factorization.

355999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50864.

The product of its digits is 54675, while the sum is 40.

The square root of 355999 is about 596.6565176046. The cubic root of 355999 is about 70.8733442541.

The spelling of 355999 in words is "three hundred fifty-five thousand, nine hundred ninety-nine".