205123623 has 4 divisors (see below), whose sum is σ = 273498168. Its totient is φ = 136749080.

The previous prime is 205123613. The next prime is 205123643. The reversal of 205123623 is 326321502.

205123623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205123623 - 2¹⁷ = 204992551 is a prime.

It is a super-2 number, since 2×205123623² = 84151401425292258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205123593 and 205123602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205123613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34187268 + ... + 34187273.

It is an arithmetic number, because the mean of its divisors is an integer number (68374542).

Almost surely, 2^205123623 is an apocalyptic number.

205123623 is a deficient number, since it is larger than the sum of its proper divisors (68374545).

205123623 is an equidigital number, since it uses as much as digits as its factorization.

205123623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68374544.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 205123623 is about 14322.1375150499. The cubic root of 205123623 is about 589.7553548577.

The spelling of 205123623 in words is "two hundred five million, one hundred twenty-three thousand, six hundred twenty-three".