190987 has 4 divisors (see below), whose sum is σ = 191896. Its totient is φ = 190080.

The previous prime is 190979. The next prime is 190997. The reversal of 190987 is 789091.

190987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 190987 - 2³ = 190979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190997) 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, 43 + ... + 619.

It is an arithmetic number, because the mean of its divisors is an integer number (47974).

2¹⁹⁰⁹⁸⁷ is an apocalyptic number.

190987 is a deficient number, since it is larger than the sum of its proper divisors (909).

190987 is an equidigital number, since it uses as much as digits as its factorization.

190987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 190987 is about 437.0205944804. The cubic root of 190987 is about 57.5883456038.

The spelling of 190987 in words is "one hundred ninety thousand, nine hundred eighty-seven".