188987 has 4 divisors (see below), whose sum is σ = 193056. Its totient is φ = 184920.

The previous prime is 188983. The next prime is 188999. The reversal of 188987 is 789881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789881 = 151 ⋅5231.

It is a cyclic number.

It is not a de Polignac number, because 188987 - 2² = 188983 is a prime.

It is a d-powerful number, because it can be written as 1 + 8⁴ + 9⁵ + 8⁴ + 8⁴ + 7⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188983) 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, 1964 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (48264).

2¹⁸⁸⁹⁸⁷ is an apocalyptic number.

188987 is a deficient number, since it is larger than the sum of its proper divisors (4069).

188987 is an equidigital number, since it uses as much as digits as its factorization.

188987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068.

The product of its digits is 32256, while the sum is 41.

The square root of 188987 is about 434.7263507081. The cubic root of 188987 is about 57.3866196802.

It can be divided in two parts, 1 and 88987, that added together give a palindrome (88988).

The spelling of 188987 in words is "one hundred eighty-eight thousand, nine hundred eighty-seven".