345639 has 16 divisors (see below), whose sum is σ = 535040. Its totient is φ = 194400.

The previous prime is 345637. The next prime is 345643. The reversal of 345639 is 936543.

It is a happy number.

It is not a de Polignac number, because 345639 - 2¹ = 345637 is a prime.

It is a Duffinian number.

Its product of digits (9720) is a multiple of the sum of its prime divisors (270).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2214 + ... + 2364.

It is an arithmetic number, because the mean of its divisors is an integer number (33440).

2³⁴⁵⁶³⁹ is an apocalyptic number.

345639 is a deficient number, since it is larger than the sum of its proper divisors (189401).

345639 is a wasteful number, since it uses less digits than its factorization.

345639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its digits is 9720, while the sum is 30.

The square root of 345639 is about 587.9107075058. The cubic root of 345639 is about 70.1790653561.

The spelling of 345639 in words is "three hundred forty-five thousand, six hundred thirty-nine".