354721 has 4 divisors (see below), whose sum is σ = 356500. Its totient is φ = 352944.

The previous prime is 354703. The next prime is 354727. The reversal of 354721 is 127453.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 239121 + 115600 = 489^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 354721 - 2⁵ = 354689 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 354692 and 354701.

It is not an unprimeable number, because it can be changed into a prime (354727) 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, 546 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (89125).

2³⁵⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

354721 is a deficient number, since it is larger than the sum of its proper divisors (1779).

354721 is a wasteful number, since it uses less digits than its factorization.

354721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778.

The product of its digits is 840, while the sum is 22.

The square root of 354721 is about 595.5845867717. The cubic root of 354721 is about 70.7884332131.

The spelling of 354721 in words is "three hundred fifty-four thousand, seven hundred twenty-one".