1215000000 has 336 divisors, whose sum is σ = 4514441568. Its totient is φ = 324000000.

The previous prime is 1214999999. The next prime is 1215000023. The reversal of 1215000000 is 5121.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

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, 242999998 + ... + 243000002.

It is an arithmetic number, because the mean of its divisors is an integer number (13435838).

Almost surely, 2^1215000000 is an apocalyptic number.

1215000000 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 1215000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2257220784).

1215000000 is an abundant number, since it is smaller than the sum of its proper divisors (3299441568).

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

1215000000 is an frugal number, since it uses more digits than its factorization.

1215000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1215000000 is about 34856.8501158668. The cubic root of 1215000000 is about 1067.0679913470.

Adding to 1215000000 its reverse (5121), we get a palindrome (1215005121).

The spelling of 1215000000 in words is "one billion, two hundred fifteen million", and thus it is an aban number.