1185987 has 16 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 708480.

The previous prime is 1185979. The next prime is 1185997. The reversal of 1185987 is 7895811.

It is not a de Polignac number, because 1185987 - 2³ = 1185979 is a prime.

1185987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1185907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2523 + ... + 2955.

It is an arithmetic number, because the mean of its divisors is an integer number (109368).

2^1185987 is an apocalyptic number.

1185987 is a deficient number, since it is larger than the sum of its proper divisors (563901).

1185987 is a wasteful number, since it uses less digits than its factorization.

1185987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its digits is 20160, while the sum is 39.

The square root of 1185987 is about 1089.0303026087. The cubic root of 1185987 is about 105.8505964496.

It can be divided in two parts, 118 and 5987, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 1185987 in words is "one million, one hundred eighty-five thousand, nine hundred eighty-seven".