1215870685 has 24 divisors (see below), whose sum is σ = 1599975936. Its totient is φ = 885914880.

The previous prime is 1215870637. The next prime is 1215870713. The reversal of 1215870685 is 5860785121.

It is not a de Polignac number, because 1215870685 - 2¹³ = 1215862493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 31224 + ... + 58366.

It is an arithmetic number, because the mean of its divisors is an integer number (66665664).

Almost surely, 2^1215870685 is an apocalyptic number.

It is an amenable number.

1215870685 is a deficient number, since it is larger than the sum of its proper divisors (384105251).

1215870685 is a wasteful number, since it uses less digits than its factorization.

1215870685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27213 (or 27196 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 1215870685 is about 34869.3373180507. The cubic root of 1215870685 is about 1067.3228221432.

The spelling of 1215870685 in words is "one billion, two hundred fifteen million, eight hundred seventy thousand, six hundred eighty-five".