346816721 has 4 divisors (see below), whose sum is σ = 349144500. Its totient is φ = 344488944.

The previous prime is 346816697. The next prime is 346816741. The reversal of 346816721 is 127618643.

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 213160000 + 133656721 = 14600^2 + 11561^2 .

It is a cyclic number.

It is not a de Polignac number, because 346816721 - 2¹⁰ = 346815697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (346816741) 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, 1163666 + ... + 1163963.

It is an arithmetic number, because the mean of its divisors is an integer number (87286125).

Almost surely, 2^346816721 is an apocalyptic number.

It is an amenable number.

346816721 is a deficient number, since it is larger than the sum of its proper divisors (2327779).

346816721 is a wasteful number, since it uses less digits than its factorization.

346816721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327778.

The product of its digits is 48384, while the sum is 38.

The square root of 346816721 is about 18623.0158943174. The cubic root of 346816721 is about 702.5868374563.

The spelling of 346816721 in words is "three hundred forty-six million, eight hundred sixteen thousand, seven hundred twenty-one".