1215518872 has 8 divisors (see below), whose sum is σ = 2279097900. Its totient is φ = 607759432.

The previous prime is 1215518861. The next prime is 1215518893. The reversal of 1215518872 is 2788155121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1215518872² = 2954972256376304768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75969922 + ... + 75969937.

Almost surely, 2^1215518872 is an apocalyptic number.

It is an amenable number.

1215518872 is a deficient number, since it is larger than the sum of its proper divisors (1063579028).

1215518872 is a wasteful number, since it uses less digits than its factorization.

1215518872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151939865 (or 151939861 counting only the distinct ones).

The product of its digits is 44800, while the sum is 40.

The square root of 1215518872 is about 34864.2922199777. The cubic root of 1215518872 is about 1067.2198686873.

The spelling of 1215518872 in words is "one billion, two hundred fifteen million, five hundred eighteen thousand, eight hundred seventy-two".