1185438987 has 12 divisors (see below), whose sum is σ = 1713405720. Its totient is φ = 789782688.

The previous prime is 1185438953. The next prime is 1185439001. The reversal of 1185438987 is 7898345811.

1185438987 is a `hidden beast` number, since 1 + 1 + 8 + 543 + 8 + 98 + 7 = 666.

It is not a de Polignac number, because 1185438987 - 2⁶ = 1185438923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1185438907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27498 + ... + 55919.

It is an arithmetic number, because the mean of its divisors is an integer number (142783810).

Almost surely, 2^1185438987 is an apocalyptic number.

1185438987 is a deficient number, since it is larger than the sum of its proper divisors (527966733).

1185438987 is a wasteful number, since it uses less digits than its factorization.

1185438987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85002 (or 84999 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The square root of 1185438987 is about 34430.2045738912. The cubic root of 1185438987 is about 1058.3429035749.

The spelling of 1185438987 in words is "one billion, one hundred eighty-five million, four hundred thirty-eight thousand, nine hundred eighty-seven".