343308781 has 4 divisors (see below), whose sum is σ = 344392092. Its totient is φ = 342225472.

The previous prime is 343308773. The next prime is 343308809. The reversal of 343308781 is 187803343.

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 63282025 + 280026756 = 7955^2 + 16734^2 .

It is a cyclic number.

It is not a de Polignac number, because 343308781 - 2³ = 343308773 is a prime.

It is a super-3 number, since 3×343308781³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 343308781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343308181) 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, 541180 + ... + 541813.

It is an arithmetic number, because the mean of its divisors is an integer number (86098023).

Almost surely, 2^343308781 is an apocalyptic number.

It is an amenable number.

343308781 is a deficient number, since it is larger than the sum of its proper divisors (1083311).

343308781 is a wasteful number, since it uses less digits than its factorization.

343308781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083310.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 343308781 is about 18528.5936055600. The cubic root of 343308781 is about 700.2099921005.

The spelling of 343308781 in words is "three hundred forty-three million, three hundred eight thousand, seven hundred eighty-one".