123633643 has 16 divisors (see below), whose sum is σ = 145069056. Its totient is φ = 103158720.

The previous prime is 123633637. The next prime is 123633647. The reversal of 123633643 is 346336321.

It is a happy number.

It is not a de Polignac number, because 123633643 - 2⁹ = 123633131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123633647) 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, 129255 + ... + 130207.

It is an arithmetic number, because the mean of its divisors is an integer number (9066816).

Almost surely, 2^123633643 is an apocalyptic number.

123633643 is a deficient number, since it is larger than the sum of its proper divisors (21435413).

123633643 is an equidigital number, since it uses as much as digits as its factorization.

123633643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434.

The product of its digits is 23328, while the sum is 31.

The square root of 123633643 is about 11119.0666424840. The cubic root of 123633643 is about 498.1715120816.

Adding to 123633643 its reverse (346336321), we get a palindrome (469969964).

The spelling of 123633643 in words is "one hundred twenty-three million, six hundred thirty-three thousand, six hundred forty-three".