1215127872 has 336 divisors, whose sum is σ = 4225259520. Its totient is φ = 341397504.

The previous prime is 1215127861. The next prime is 1215127877. The reversal of 1215127872 is 2787215121.

1215127872 is a `hidden beast` number, since 1 + 2 + 1 + 512 + 78 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×1215127872² = 2953071490622496768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215127877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9567873 + ... + 9567999.

Almost surely, 2^1215127872 is an apocalyptic number.

1215127872 is a gapful number since it is divisible by the number (12) 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 1215127872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2112629760).

1215127872 is an abundant number, since it is smaller than the sum of its proper divisors (3010131648).

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

1215127872 is a wasteful number, since it uses less digits than its factorization.

1215127872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 252 counting only the distinct ones).

The product of its digits is 15680, while the sum is 36.

The square root of 1215127872 is about 34858.6843125210. The cubic root of 1215127872 is about 1067.1054243598.

The spelling of 1215127872 in words is "one billion, two hundred fifteen million, one hundred twenty-seven thousand, eight hundred seventy-two".