123945 has 8 divisors (see below), whose sum is σ = 198336. Its totient is φ = 66096.

The previous prime is 123941. The next prime is 123953. The reversal of 123945 is 549321.

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

It is not a de Polignac number, because 123945 - 2² = 123941 is a prime.

123945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (123941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4117 + ... + 4146.

It is an arithmetic number, because the mean of its divisors is an integer number (24792).

2¹²³⁹⁴⁵ is an apocalyptic number.

123945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123945 is a deficient number, since it is larger than the sum of its proper divisors (74391).

123945 is an equidigital number, since it uses as much as digits as its factorization.

123945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271.

The product of its digits is 1080, while the sum is 24.

The square root of 123945 is about 352.0582338193. The cubic root of 123945 is about 49.8589357250.

It can be divided in two parts, 1239 and 45, that multiplied together give a palindrome (55755).

The spelling of 123945 in words is "one hundred twenty-three thousand, nine hundred forty-five".