2345 has 8 divisors (see below), whose sum is σ = 3264. Its totient is φ = 1584.

The previous prime is 2341. The next prime is 2347. The reversal of 2345 is 5432.

2345 is nontrivially palindromic in base 16.

2345 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2345 - 2² = 2341 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

2345 is an undulating number in base 16.

It is a Curzon number.

It is a straight-line number, since its digits are in arithmetic progression.

It is a plaindrome in base 10.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (2341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2 + ... + 68.

It is an arithmetic number, because the mean of its divisors is an integer number (408).

2²³⁴⁵ is an apocalyptic number.

It is an amenable number.

2345 is a deficient number, since it is larger than the sum of its proper divisors (919).

2345 is an equidigital number, since it uses as much as digits as its factorization.

2345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79.

The product of its digits is 120, while the sum is 14.

The square root of 2345 is about 48.4252000512. The cubic root of 2345 is about 13.2855931586.

Adding to 2345 its reverse (5432), we get a palindrome (7777).

It can be divided in two parts, 23 and 45, that multiplied together give a triangular number (1035 = T₄₅).

The spelling of 2345 in words is "two thousand, three hundred forty-five".