123665623 has 16 divisors (see below), whose sum is σ = 132457600. Its totient is φ = 115123680.

The previous prime is 123665621. The next prime is 123665651. The reversal of 123665623 is 326566321.

It is a cyclic number.

It is not a de Polignac number, because 123665623 - 2¹ = 123665621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123665621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436840 + ... + 437122.

It is an arithmetic number, because the mean of its divisors is an integer number (8278600).

Almost surely, 2^123665623 is an apocalyptic number.

123665623 is a deficient number, since it is larger than the sum of its proper divisors (8791977).

123665623 is a wasteful number, since it uses less digits than its factorization.

123665623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622.

The product of its digits is 38880, while the sum is 34.

The square root of 123665623 is about 11120.5046198453. The cubic root of 123665623 is about 498.2144619646.

The spelling of 123665623 in words is "one hundred twenty-three million, six hundred sixty-five thousand, six hundred twenty-three".