123965 has 4 divisors (see below), whose sum is σ = 148764. Its totient is φ = 99168.

The previous prime is 123953. The next prime is 123973. The reversal of 123965 is 569321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 32761 = 302^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 123965 - 2¹² = 119869 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12392 + ... + 12401.

It is an arithmetic number, because the mean of its divisors is an integer number (37191).

2¹²³⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

123965 is a deficient number, since it is larger than the sum of its proper divisors (24799).

123965 is an equidigital number, since it uses as much as digits as its factorization.

123965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24798.

The product of its digits is 1620, while the sum is 26.

The square root of 123965 is about 352.0866370654. The cubic root of 123965 is about 49.8616173582.

The spelling of 123965 in words is "one hundred twenty-three thousand, nine hundred sixty-five".