355821 has 8 divisors (see below), whose sum is σ = 480480. Its totient is φ = 234192.

The previous prime is 355819. The next prime is 355841. The reversal of 355821 is 128553.

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

It is not a de Polignac number, because 355821 - 2¹ = 355819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 355791 and 355800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355811) 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 7 ways as a sum of consecutive naturals, for example, 466 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (60060).

2³⁵⁵⁸²¹ is an apocalyptic number.

It is an amenable number.

355821 is a deficient number, since it is larger than the sum of its proper divisors (124659).

355821 is a wasteful number, since it uses less digits than its factorization.

355821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515.

The product of its digits is 1200, while the sum is 24.

The square root of 355821 is about 596.5073344059. The cubic root of 355821 is about 70.8615300276.

It can be divided in two parts, 355 and 821, that added together give a triangular number (1176 = T₄₈).

The spelling of 355821 in words is "three hundred fifty-five thousand, eight hundred twenty-one".