12400000 has 96 divisors (see below), whose sum is σ = 31872960. Its totient is φ = 4800000.

The previous prime is 12399991. The next prime is 12400001. The reversal of 12400000 is 421.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399985 + ... + 400015.

It is an arithmetic number, because the mean of its divisors is an integer number (332010).

Almost surely, 2^12400000 is an apocalyptic number.

12400000 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 12400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15936480).

12400000 is an abundant number, since it is smaller than the sum of its proper divisors (19472960).

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

12400000 is an frugal number, since it uses more digits than its factorization.

12400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 12400000 is about 3521.3633723318. The cubic root of 12400000 is about 231.4589054526.

Adding to 12400000 its reverse (421), we get a palindrome (12400421).

The spelling of 12400000 in words is "twelve million, four hundred thousand".