123623021 has 4 divisors (see below), whose sum is σ = 123934812. Its totient is φ = 123311232.

The previous prime is 123623011. The next prime is 123623023. The reversal of 123623021 is 120326321.

It is a happy number.

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 37393225 + 86229796 = 6115^2 + 9286^2 .

It is a cyclic number.

It is not a de Polignac number, because 123623021 - 2¹⁰ = 123621997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123622984 and 123623002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123623023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155300 + ... + 156093.

It is an arithmetic number, because the mean of its divisors is an integer number (30983703).

Almost surely, 2^123623021 is an apocalyptic number.

It is an amenable number.

123623021 is a deficient number, since it is larger than the sum of its proper divisors (311791).

123623021 is an equidigital number, since it uses as much as digits as its factorization.

123623021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311790.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 123623021 is about 11118.5889842192. The cubic root of 123623021 is about 498.1572448503.

Adding to 123623021 its reverse (120326321), we get a palindrome (243949342).

The spelling of 123623021 in words is "one hundred twenty-three million, six hundred twenty-three thousand, twenty-one".