1243040123 has 24 divisors (see below), whose sum is σ = 1389409200. Its totient is φ = 1110754944.

The previous prime is 1243040081. The next prime is 1243040147. The reversal of 1243040123 is 3210403421.

It is not a de Polignac number, because 1243040123 - 2²⁸ = 974604667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243040095 and 1243040104.

It is not an unprimeable number, because it can be changed into a prime (1243049123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1681688 + ... + 1682426.

It is an arithmetic number, because the mean of its divisors is an integer number (57892050).

Almost surely, 2^1243040123 is an apocalyptic number.

1243040123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1243040123 is a deficient number, since it is larger than the sum of its proper divisors (146369077).

1243040123 is a wasteful number, since it uses less digits than its factorization.

1243040123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1243040123 is about 35256.7741434182. The cubic root of 1243040123 is about 1075.2143428374.

Adding to 1243040123 its reverse (3210403421), we get a palindrome (4453443544).

The spelling of 1243040123 in words is "one billion, two hundred forty-three million, forty thousand, one hundred twenty-three".