12400120 has 32 divisors (see below), whose sum is σ = 28098720. Its totient is φ = 4924800.

The previous prime is 12400109. The next prime is 12400127. The reversal of 12400120 is 2100421.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12400097 and 12400106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5014 + ... + 7066.

It is an arithmetic number, because the mean of its divisors is an integer number (878085).

Almost surely, 2^12400120 is an apocalyptic number.

12400120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400120 is an abundant number, since it is smaller than the sum of its proper divisors (15698600).

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

12400120 is a wasteful number, since it uses less digits than its factorization.

12400120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215 (or 2211 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 12400120 is about 3521.3804111456. The cubic root of 12400120 is about 231.4596520918.

Adding to 12400120 its reverse (2100421), we get a palindrome (14500541).

The spelling of 12400120 in words is "twelve million, four hundred thousand, one hundred twenty".