342640 has 20 divisors (see below), whose sum is σ = 796824. Its totient is φ = 137024.

The previous prime is 342607. The next prime is 342647. The reversal of 342640 is 46243.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342647) by changing a digit.

342640 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, 2062 + ... + 2221.

2³⁴²⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

342640 is an abundant number, since it is smaller than the sum of its proper divisors (454184).

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

342640 is a wasteful number, since it uses less digits than its factorization.

342640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296 (or 4290 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 342640 is about 585.3545933876. The cubic root of 342640 is about 69.9755016312.

Adding to 342640 its reverse (46243), we get a palindrome (388883).

The spelling of 342640 in words is "three hundred forty-two thousand, six hundred forty".