348923721 has 16 divisors (see below), whose sum is σ = 479354240. Its totient is φ = 225659520.

The previous prime is 348923719. The next prime is 348923747. The reversal of 348923721 is 127329843.

It is not a de Polignac number, because 348923721 - 2¹ = 348923719 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is the 18680-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 348923721.

It is not an unprimeable number, because it can be changed into a prime (348923761) by changing a digit.

It is a nontrivial repunit in base 18679.

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 15 ways as a sum of consecutive naturals, for example, 300 + ... + 26418.

It is an arithmetic number, because the mean of its divisors is an integer number (29959640).

Almost surely, 2^348923721 is an apocalyptic number.

It is an amenable number.

348923721 is a deficient number, since it is larger than the sum of its proper divisors (130430519).

348923721 is a wasteful number, since it uses less digits than its factorization.

348923721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26256.

The product of its digits is 72576, while the sum is 39.

The square root of 348923721 is about 18679.5000200755. The cubic root of 348923721 is about 704.0067639082.

The spelling of 348923721 in words is "three hundred forty-eight million, nine hundred twenty-three thousand, seven hundred twenty-one".