1215450000 has 360 divisors, whose sum is σ = 4426419816. Its totient is φ = 311040000.

The previous prime is 1215449999. The next prime is 1215450023. The reversal of 1215450000 is 545121.

1215450000 is a `hidden beast` number, since 1 + 215 + 450 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 1109689344 + 105760656 = 33312^2 + 10284^2 .

It is a tau number, because it is divible by the number of its divisors (360).

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16649964 + ... + 16650036.

Almost surely, 2^1215450000 is an apocalyptic number.

1215450000 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 1215450000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213209908).

1215450000 is an abundant number, since it is smaller than the sum of its proper divisors (3210969816).

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

1215450000 is an equidigital number, since it uses as much as digits as its factorization.

1215450000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1215450000 is about 34863.3044905385. The cubic root of 1215450000 is about 1067.1997118756.

Adding to 1215450000 its reverse (545121), we get a palindrome (1215995121).

The spelling of 1215450000 in words is "one billion, two hundred fifteen million, four hundred fifty thousand".