1215438687 has 12 divisors (see below), whose sum is σ = 1758572400. Its totient is φ = 808936128.

The previous prime is 1215438671. The next prime is 1215438709. The reversal of 1215438687 is 7868345121.

1215438687 is a `hidden beast` number, since 1 + 21 + 543 + 8 + 6 + 87 = 666.

It is not a de Polignac number, because 1215438687 - 2⁴ = 1215438671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215438187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107338 + ... + 118119.

It is an arithmetic number, because the mean of its divisors is an integer number (146547700).

Almost surely, 2^1215438687 is an apocalyptic number.

1215438687 is a deficient number, since it is larger than the sum of its proper divisors (543133713).

1215438687 is a wasteful number, since it uses less digits than its factorization.

1215438687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226062 (or 226059 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 1215438687 is about 34863.1422422019. The cubic root of 1215438687 is about 1067.1964008200.

The spelling of 1215438687 in words is "one billion, two hundred fifteen million, four hundred thirty-eight thousand, six hundred eighty-seven".