347968721 has 4 divisors (see below), whose sum is σ = 353162352. Its totient is φ = 342775092.

The previous prime is 347968667. The next prime is 347968727. The reversal of 347968721 is 127869743.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127869743 = 37 ⋅3455939.

It is a cyclic number.

It is not a de Polignac number, because 347968721 - 2¹⁸ = 347706577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (347968727) 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, 2596715 + ... + 2596848.

It is an arithmetic number, because the mean of its divisors is an integer number (88290588).

Almost surely, 2^347968721 is an apocalyptic number.

It is an amenable number.

347968721 is a deficient number, since it is larger than the sum of its proper divisors (5193631).

347968721 is an equidigital number, since it uses as much as digits as its factorization.

347968721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193630.

The product of its digits is 508032, while the sum is 47.

The square root of 347968721 is about 18653.9197221388. The cubic root of 347968721 is about 703.3638910427.

The spelling of 347968721 in words is "three hundred forty-seven million, nine hundred sixty-eight thousand, seven hundred twenty-one".