12312400 has 30 divisors (see below), whose sum is σ = 29581502. Its totient is φ = 4924800.

The previous prime is 12312397. The next prime is 12312401. The reversal of 12312400 is 421321.

It can be written as a sum of positive squares in 3 ways, for example, as 118336 + 12194064 = 344^2 + 3492^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14991 + ... + 15790.

Almost surely, 2^12312400 is an apocalyptic number.

12312400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12312400 is an abundant number, since it is smaller than the sum of its proper divisors (17269102).

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

12312400 is a wasteful number, since it uses less digits than its factorization.

12312400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30799 (or 30788 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 12312400 is about 3508.9029624656. The cubic root of 12312400 is about 230.9125685000.

Adding to 12312400 its reverse (421321), we get a palindrome (12733721).

The spelling of 12312400 in words is "twelve million, three hundred twelve thousand, four hundred".