113987 has 4 divisors (see below), whose sum is σ = 117696. Its totient is φ = 110280.

The previous prime is 113983. The next prime is 113989. The reversal of 113987 is 789311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 113987 - 2² = 113983 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 113987.

It is not an unprimeable number, because it can be changed into a prime (113983) 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, 1808 + ... + 1869.

It is an arithmetic number, because the mean of its divisors is an integer number (29424).

2¹¹³⁹⁸⁷ is an apocalyptic number.

113987 is a deficient number, since it is larger than the sum of its proper divisors (3709).

113987 is an equidigital number, since it uses as much as digits as its factorization.

113987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708.

The product of its digits is 1512, while the sum is 29.

The square root of 113987 is about 337.6196084353. The cubic root of 113987 is about 48.4862326743.

The spelling of 113987 in words is "one hundred thirteen thousand, nine hundred eighty-seven".