1308111987 has 48 divisors (see below), whose sum is σ = 2235932160. Its totient is φ = 673904448.

The previous prime is 1308111983. The next prime is 1308111989. The reversal of 1308111987 is 7891118031.

It is not a de Polignac number, because 1308111987 - 2² = 1308111983 is a prime.

It is a super-2 number, since 2×1308111987² = 3422313941066176338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1308111983) 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 47 ways as a sum of consecutive naturals, for example, 74214 + ... + 90132.

It is an arithmetic number, because the mean of its divisors is an integer number (46581920).

Almost surely, 2^1308111987 is an apocalyptic number.

1308111987 is a deficient number, since it is larger than the sum of its proper divisors (927820173).

1308111987 is a wasteful number, since it uses less digits than its factorization.

1308111987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15992 (or 15985 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 39.

The square root of 1308111987 is about 36167.8308307258. The cubic root of 1308111987 is about 1093.6582711339.

The spelling of 1308111987 in words is "one billion, three hundred eight million, one hundred eleven thousand, nine hundred eighty-seven".