340428 has 24 divisors (see below), whose sum is σ = 866880. Its totient is φ = 103120.

The previous prime is 340409. The next prime is 340429. The reversal of 340428 is 824043.

It is a happy number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 340428.

It is not an unprimeable number, because it can be changed into a prime (340429) by changing a digit.

340428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (36120).

2³⁴⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

340428 is an abundant number, since it is smaller than the sum of its proper divisors (526452).

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

340428 is a wasteful number, since it uses less digits than its factorization.

340428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 340428 is about 583.4620810301. The cubic root of 340428 is about 69.8245948526.

The spelling of 340428 in words is "three hundred forty thousand, four hundred twenty-eight".