642345 has 32 divisors (see below), whose sum is σ = 1192320. Its totient is φ = 291840.

The previous prime is 642281. The next prime is 642359. The reversal of 642345 is 543246.

642345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642345 - 2⁶ = 642281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2691 + ... + 2919.

It is an arithmetic number, because the mean of its divisors is an integer number (37260).

2⁶⁴²³⁴⁵ is an apocalyptic number.

It is an amenable number.

642345 is a deficient number, since it is larger than the sum of its proper divisors (549975).

642345 is a wasteful number, since it uses less digits than its factorization.

642345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265.

The product of its digits is 2880, while the sum is 24.

The square root of 642345 is about 801.4642849185. The cubic root of 642345 is about 86.2825124224.

Subtracting from 642345 its reverse (543246), we obtain a palindrome (99099).

The spelling of 642345 in words is "six hundred forty-two thousand, three hundred forty-five".