42345 has 12 divisors (see below), whose sum is σ = 73476. Its totient is φ = 22560.

The previous prime is 42337. The next prime is 42349. The reversal of 42345 is 54324.

It is a happy number.

42345 is digitally balanced in base 2 and base 6, because in such bases 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 20736 + 21609 = 144^2 + 147^2 .

It is not a de Polignac number, because 42345 - 2³ = 42337 is a prime.

42345 is strictly pandigital in base 6.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42349) 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, 426 + ... + 515.

It is an arithmetic number, because the mean of its divisors is an integer number (6123).

2⁴²³⁴⁵ is an apocalyptic number.

42345 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42345 is a deficient number, since it is larger than the sum of its proper divisors (31131).

42345 is a wasteful number, since it uses less digits than its factorization.

42345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 949 counting only the distinct ones).

The product of its digits is 480, while the sum is 18.

The square root of 42345 is about 205.7790076757. The cubic root of 42345 is about 34.8551839482.

Adding to 42345 its reverse (54324), we get a palindrome (96669).

The spelling of 42345 in words is "forty-two thousand, three hundred forty-five".