343781 has 4 divisors (see below), whose sum is σ = 358752. Its totient is φ = 328812.

The previous prime is 343771. The next prime is 343787. The reversal of 343781 is 187343.

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: 187343 = 13 ⋅14411.

It is a cyclic number.

It is not a de Polignac number, because 343781 - 2¹⁰ = 342757 is a prime.

It is a super-2 number, since 2×343781² = 236370751922, which contains 22 as substring.

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 343781.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 343781.

It is not an unprimeable number, because it can be changed into a prime (343787) 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, 7451 + ... + 7496.

It is an arithmetic number, because the mean of its divisors is an integer number (89688).

2³⁴³⁷⁸¹ is an apocalyptic number.

It is an amenable number.

343781 is a deficient number, since it is larger than the sum of its proper divisors (14971).

343781 is a wasteful number, since it uses less digits than its factorization.

343781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14970.

The product of its digits is 2016, while the sum is 26.

The square root of 343781 is about 586.3284062708. The cubic root of 343781 is about 70.0530889781.

The spelling of 343781 in words is "three hundred forty-three thousand, seven hundred eighty-one".