1243230123 has 16 divisors (see below), whose sum is σ = 1687743360. Its totient is φ = 813802176.

The previous prime is 1243230119. The next prime is 1243230137. The reversal of 1243230123 is 3210323421.

It is not a de Polignac number, because 1243230123 - 2² = 1243230119 is a prime.

It is a super-2 number, since 2×1243230123² = 3091242277469190258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1243230123.

It is not an unprimeable number, because it can be changed into a prime (1243230623) 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, 163911 + ... + 171327.

It is an arithmetic number, because the mean of its divisors is an integer number (105483960).

Almost surely, 2^1243230123 is an apocalyptic number.

1243230123 is a deficient number, since it is larger than the sum of its proper divisors (444513237).

1243230123 is an equidigital number, since it uses as much as digits as its factorization.

1243230123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8426.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1243230123 is about 35259.4685581051. The cubic root of 1243230123 is about 1075.2691225970.

Adding to 1243230123 its reverse (3210323421), we get a palindrome (4453553544).

The spelling of 1243230123 in words is "one billion, two hundred forty-three million, two hundred thirty thousand, one hundred twenty-three".