12172400 has 30 divisors (see below), whose sum is σ = 29245152. Its totient is φ = 4868800.

The previous prime is 12172393. The next prime is 12172409. The reversal of 12172400 is 427121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172409) 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 5 ways as a sum of consecutive naturals, for example, 14816 + ... + 15615.

Almost surely, 2^12172400 is an apocalyptic number.

12172400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12172400 is an abundant number, since it is smaller than the sum of its proper divisors (17072752).

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

12172400 is a wasteful number, since it uses less digits than its factorization.

12172400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30449 (or 30438 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 12172400 is about 3488.8966737351. The cubic root of 12172400 is about 230.0340214324.

Adding to 12172400 its reverse (427121), we get a palindrome (12599521).

The spelling of 12172400 in words is "twelve million, one hundred seventy-two thousand, four hundred".