343840 has 48 divisors (see below), whose sum is σ = 931392. Its totient is φ = 117504.

The previous prime is 343831. The next prime is 343891. The reversal of 343840 is 48343.

343840 = T₇₀ + T₇₁ + ... + T₁₃₃.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 967 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (19404).

2³⁴³⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 343840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (465696).

343840 is an abundant number, since it is smaller than the sum of its proper divisors (587552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

343840 is a wasteful number, since it uses less digits than its factorization.

343840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 343840 is about 586.3787172127. The cubic root of 343840 is about 70.0570962733.

The spelling of 343840 in words is "three hundred forty-three thousand, eight hundred forty".