123243538 has 32 divisors (see below), whose sum is σ = 219156480. Its totient is φ = 51354000.

The previous prime is 123243529. The next prime is 123243539. The reversal of 123243538 is 835342321.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (123243539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8203 + ... + 17713.

It is an arithmetic number, because the mean of its divisors is an integer number (6848640).

Almost surely, 2^123243538 is an apocalyptic number.

123243538 is a deficient number, since it is larger than the sum of its proper divisors (95912942).

123243538 is a wasteful number, since it uses less digits than its factorization.

123243538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9574.

The product of its digits is 17280, while the sum is 31.

The square root of 123243538 is about 11101.5106179294. The cubic root of 123243538 is about 497.6469947697.

Adding to 123243538 its reverse (835342321), we get a palindrome (958585859).

The spelling of 123243538 in words is "one hundred twenty-three million, two hundred forty-three thousand, five hundred thirty-eight".