342639 has 12 divisors (see below), whose sum is σ = 540072. Its totient is φ = 207600.

The previous prime is 342607. The next prime is 342647. The reversal of 342639 is 936243.

It is not a de Polignac number, because 342639 - 2⁵ = 342607 is a prime.

342639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1632 + ... + 1829.

It is an arithmetic number, because the mean of its divisors is an integer number (45006).

2³⁴²⁶³⁹ is an apocalyptic number.

342639 is a deficient number, since it is larger than the sum of its proper divisors (197433).

342639 is a wasteful number, since it uses less digits than its factorization.

342639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478 (or 3475 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 342639 is about 585.3537392039. The cubic root of 342639 is about 69.9754335563.

The spelling of 342639 in words is "three hundred forty-two thousand, six hundred thirty-nine".