347921 has 8 divisors (see below), whose sum is σ = 415104. Its totient is φ = 285120.

The previous prime is 347899. The next prime is 347929. The reversal of 347921 is 129743.

347921 is nontrivially palindromic in base 8.

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 347921 - 2¹⁴ = 331537 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 347921.

It is not an unprimeable number, because it can be changed into a prime (347929) 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, 920 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (51888).

2³⁴⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

347921 is a deficient number, since it is larger than the sum of its proper divisors (67183).

347921 is a wasteful number, since it uses less digits than its factorization.

347921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191.

The product of its digits is 1512, while the sum is 26.

The square root of 347921 is about 589.8482855786. The cubic root of 347921 is about 70.3331736081. Note that the first 3 decimals are identical.

The spelling of 347921 in words is "three hundred forty-seven thousand, nine hundred twenty-one".