342740 has 12 divisors (see below), whose sum is σ = 719796. Its totient is φ = 137088.

The previous prime is 342733. The next prime is 342757. The reversal of 342740 is 47243.

342740 = T₃₃₅ + T₃₃₆ + ... + T₃₄₀.

It is a happy number.

342740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42436 + 300304 = 206^2 + 548^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 17137 = 342740 / (3 + 4 + 2 + 7 + 4 + 0).

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 342740.

It is an unprimeable number.

342740 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 3 ways as a sum of consecutive naturals, for example, 8549 + ... + 8588.

It is an arithmetic number, because the mean of its divisors is an integer number (59983).

2³⁴²⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

342740 is an abundant number, since it is smaller than the sum of its proper divisors (377056).

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

342740 is a wasteful number, since it uses less digits than its factorization.

342740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17146 (or 17144 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 342740 is about 585.4400054660. The cubic root of 342740 is about 69.9823084542.

Adding to 342740 its reverse (47243), we get a palindrome (389983).

The spelling of 342740 in words is "three hundred forty-two thousand, seven hundred forty", and thus it is an iban number.