1215299400 has 192 divisors, whose sum is σ = 4559172480. Its totient is φ = 261427200.

The previous prime is 1215299387. The next prime is 1215299419. The reversal of 1215299400 is 49925121.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62890 + ... + 79910.

It is an arithmetic number, because the mean of its divisors is an integer number (23745690).

Almost surely, 2^1215299400 is an apocalyptic number.

1215299400 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 1215299400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2279586240).

1215299400 is an abundant number, since it is smaller than the sum of its proper divisors (3343873080).

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

1215299400 is a wasteful number, since it uses less digits than its factorization.

1215299400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17064 (or 17055 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1215299400 is about 34861.1445595236. The cubic root of 1215299400 is about 1067.1556330255.

The spelling of 1215299400 in words is "one billion, two hundred fifteen million, two hundred ninety-nine thousand, four hundred".