12015900 has 162 divisors, whose sum is σ = 41299440. Its totient is φ = 2920320.

The previous prime is 12015863. The next prime is 12015907. The reversal of 12015900 is 951021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12015907) 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 53 ways as a sum of consecutive naturals, for example, 152061 + ... + 152139.

Almost surely, 2^12015900 is an apocalyptic number.

12015900 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 12015900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20649720).

12015900 is an abundant number, since it is smaller than the sum of its proper divisors (29283540).

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

12015900 is a wasteful number, since it uses less digits than its factorization.

12015900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 12015900 is about 3466.3958227531. The cubic root of 12015900 is about 229.0439203085.

Adding to 12015900 its reverse (951021), we get a palindrome (12966921).

The spelling of 12015900 in words is "twelve million, fifteen thousand, nine hundred".