1215887312 has 20 divisors (see below), whose sum is σ = 2363317860. Its totient is φ = 605998848.

The previous prime is 1215887297. The next prime is 1215887317. The reversal of 1215887312 is 2137885121.

It can be written as a sum of positive squares in 2 ways, for example, as 25361296 + 1190526016 = 5036^2 + 34504^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215887317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116387 + ... + 126402.

It is an arithmetic number, because the mean of its divisors is an integer number (118165893).

Almost surely, 2^1215887312 is an apocalyptic number.

It is an amenable number.

1215887312 is a deficient number, since it is larger than the sum of its proper divisors (1147430548).

1215887312 is a wasteful number, since it uses less digits than its factorization.

1215887312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243110 (or 243104 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 1215887312 is about 34869.5757358761. The cubic root of 1215887312 is about 1067.3276873250.

The spelling of 1215887312 in words is "one billion, two hundred fifteen million, eight hundred eighty-seven thousand, three hundred twelve".