1232400312 has 256 divisors, whose sum is σ = 4260211200. Its totient is φ = 324311040.

The previous prime is 1232400277. The next prime is 1232400331. The reversal of 1232400312 is 2130042321.

1232400312 is a `hidden beast` number, since 1 + 232 + 400 + 31 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 523923 + ... + 526269.

It is an arithmetic number, because the mean of its divisors is an integer number (16641450).

Almost surely, 2^1232400312 is an apocalyptic number.

1232400312 is a gapful number since it is divisible by the number (12) 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 1232400312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130105600).

1232400312 is an abundant number, since it is smaller than the sum of its proper divisors (3027810888).

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

1232400312 is a wasteful number, since it uses less digits than its factorization.

1232400312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1232400312 is about 35105.5595597051. The cubic root of 1232400312 is about 1072.1377797774.

Adding to 1232400312 its reverse (2130042321), we get a palindrome (3362442633).

The spelling of 1232400312 in words is "one billion, two hundred thirty-two million, four hundred thousand, three hundred twelve".