354821 has 4 divisors (see below), whose sum is σ = 370272. Its totient is φ = 339372.

The previous prime is 354799. The next prime is 354829. The reversal of 354821 is 128453.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 354821 - 2¹⁰ = 353797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 15427 = 354821 / (3 + 5 + 4 + 8 + 2 + 1).

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (354829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7691 + ... + 7736.

It is an arithmetic number, because the mean of its divisors is an integer number (92568).

2³⁵⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

354821 is a deficient number, since it is larger than the sum of its proper divisors (15451).

354821 is a wasteful number, since it uses less digits than its factorization.

354821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15450.

The product of its digits is 960, while the sum is 23.

The square root of 354821 is about 595.6685319874. The cubic root of 354821 is about 70.7950846173.

The spelling of 354821 in words is "three hundred fifty-four thousand, eight hundred twenty-one".