343981 has 4 divisors (see below), whose sum is σ = 375264. Its totient is φ = 312700.

The previous prime is 343963. The next prime is 343997. The reversal of 343981 is 189343.

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.

It is a cyclic number.

It is not a de Polignac number, because 343981 - 2¹⁷ = 212909 is a prime.

It is a super-2 number, since 2×343981² = 236645856722, 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 (343901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15625 + ... + 15646.

It is an arithmetic number, because the mean of its divisors is an integer number (93816).

2³⁴³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

343981 is a deficient number, since it is larger than the sum of its proper divisors (31283).

343981 is a wasteful number, since it uses less digits than its factorization.

343981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31282.

The product of its digits is 2592, while the sum is 28.

The square root of 343981 is about 586.4989343554. The cubic root of 343981 is about 70.0666711731.

The spelling of 343981 in words is "three hundred forty-three thousand, nine hundred eighty-one".