343778 has 4 divisors (see below), whose sum is σ = 515670. Its totient is φ = 171888.

The previous prime is 343771. The next prime is 343787. The reversal of 343778 is 877343.

343778 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 277729 + 66049 = 527^2 + 257^2 .

It is not an unprimeable number, because it can be changed into a prime (343771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85943 + ... + 85946.

2³⁴³⁷⁷⁸ is an apocalyptic number.

343778 is a deficient number, since it is larger than the sum of its proper divisors (171892).

343778 is a wasteful number, since it uses less digits than its factorization.

343778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171891.

The product of its digits is 14112, while the sum is 32.

The square root of 343778 is about 586.3258479719. The cubic root of 343778 is about 70.0528852051.

The spelling of 343778 in words is "three hundred forty-three thousand, seven hundred seventy-eight".