343904721 has 8 divisors (see below), whose sum is σ = 458782464. Its totient is φ = 229148400.

The previous prime is 343904719. The next prime is 343904723. The reversal of 343904721 is 127409343.

It is an interprime number because it is at equal distance from previous prime (343904719) and next prime (343904723).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 343904721 - 2¹ = 343904719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (343904723) 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, 23526 + ... + 35231.

It is an arithmetic number, because the mean of its divisors is an integer number (57347808).

Almost surely, 2^343904721 is an apocalyptic number.

It is an amenable number.

343904721 is a deficient number, since it is larger than the sum of its proper divisors (114877743).

343904721 is a wasteful number, since it uses less digits than its factorization.

343904721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60711.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 343904721 is about 18544.6682634120. The cubic root of 343904721 is about 700.6149161303.

The spelling of 343904721 in words is "three hundred forty-three million, nine hundred four thousand, seven hundred twenty-one".