1215106200 has 432 divisors, whose sum is σ = 5132640240. Its totient is φ = 252172800.

The previous prime is 1215106199. The next prime is 1215106201. The reversal of 1215106200 is 26015121.

It is an interprime number because it is at equal distance from previous prime (1215106199) and next prime (1215106201).

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 (1215106201) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1524202 + ... + 1524998.

Almost surely, 2^1215106200 is an apocalyptic number.

1215106200 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 1215106200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2566320120).

1215106200 is an abundant number, since it is smaller than the sum of its proper divisors (3917534040).

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

1215106200 is a wasteful number, since it uses less digits than its factorization.

1215106200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1215106200 is about 34858.3734560292. The cubic root of 1215106200 is about 1067.0990803235.

The spelling of 1215106200 in words is "one billion, two hundred fifteen million, one hundred six thousand, two hundred".