12123305440 has 48 divisors (see below), whose sum is σ = 28909025712. Its totient is φ = 4803994624.

The previous prime is 12123305431. The next prime is 12123305449. The reversal of 12123305440 is 4450332121.

It is an interprime number because it is at equal distance from previous prime (12123305431) and next prime (12123305449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123305449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336949 + ... + 371188.

It is an arithmetic number, because the mean of its divisors is an integer number (602271369).

Almost surely, 2^12123305440 is an apocalyptic number.

12123305440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123305440 is an abundant number, since it is smaller than the sum of its proper divisors (16785720272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12123305440 is a wasteful number, since it uses less digits than its factorization.

12123305440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708259 (or 708251 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 12123305440 its reverse (4450332121), we get a palindrome (16573637561).

The spelling of 12123305440 in words is "twelve billion, one hundred twenty-three million, three hundred five thousand, four hundred forty".