343356781 has 16 divisors (see below), whose sum is σ = 370016640. Its totient is φ = 317943360.

The previous prime is 343356773. The next prime is 343356787. The reversal of 343356781 is 187653343.

It is a cyclic number.

It is not a de Polignac number, because 343356781 - 2³ = 343356773 is a prime.

It is a super-2 number, since 2×343356781² = 235787758117363922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343356787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73930 + ... + 78436.

It is an arithmetic number, because the mean of its divisors is an integer number (23126040).

Almost surely, 2^343356781 is an apocalyptic number.

It is an amenable number.

343356781 is a deficient number, since it is larger than the sum of its proper divisors (26659859).

343356781 is a wasteful number, since it uses less digits than its factorization.

343356781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4644.

The product of its digits is 181440, while the sum is 40.

The square root of 343356781 is about 18529.8888555760. Note that the first 4 decimals coincide. The cubic root of 343356781 is about 700.2426240586.

The spelling of 343356781 in words is "three hundred forty-three million, three hundred fifty-six thousand, seven hundred eighty-one".