123820205 has 8 divisors (see below), whose sum is σ = 152208504. Its totient is φ = 96640000.

The previous prime is 123820183. The next prime is 123820211. The reversal of 123820205 is 502028321.

It can be written as a sum of positive squares in 4 ways, for example, as 3632836 + 120187369 = 1906^2 + 10963^2 .

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

It is not a de Polignac number, because 123820205 - 2¹⁴ = 123803821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301796 + ... + 302205.

It is an arithmetic number, because the mean of its divisors is an integer number (19026063).

Almost surely, 2^123820205 is an apocalyptic number.

It is an amenable number.

123820205 is a deficient number, since it is larger than the sum of its proper divisors (28388299).

123820205 is an equidigital number, since it uses as much as digits as its factorization.

123820205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604047.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 123820205 is about 11127.4527633237. The cubic root of 123820205 is about 498.4219648496.

Adding to 123820205 its reverse (502028321), we get a palindrome (625848526).

The spelling of 123820205 in words is "one hundred twenty-three million, eight hundred twenty thousand, two hundred five".