1232123440 has 80 divisors (see below), whose sum is σ = 2901653568. Its totient is φ = 486540288.

The previous prime is 1232123437. The next prime is 1232123441. The reversal of 1232123440 is 443212321.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1232123441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3303094 + ... + 3303466.

Almost surely, 2^1232123440 is an apocalyptic number.

1232123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1232123440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1450826784).

1232123440 is an abundant number, since it is smaller than the sum of its proper divisors (1669530128).

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

1232123440 is a wasteful number, since it uses less digits than its factorization.

1232123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1232123440 is about 35101.6159172195. The cubic root of 1232123440 is about 1072.0574846652.

Adding to 1232123440 its reverse (443212321), we get a palindrome (1675335761).

The spelling of 1232123440 in words is "one billion, two hundred thirty-two million, one hundred twenty-three thousand, four hundred forty".