190240987 has 4 divisors (see below), whose sum is σ = 194665240. Its totient is φ = 185816736.

The previous prime is 190240979. The next prime is 190241003. The reversal of 190240987 is 789042091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789042091 = 2797 ⋅282103.

It is a cyclic number.

It is not a de Polignac number, because 190240987 - 2³ = 190240979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190240907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212062 + ... + 2212147.

It is an arithmetic number, because the mean of its divisors is an integer number (48666310).

Almost surely, 2^190240987 is an apocalyptic number.

190240987 is a deficient number, since it is larger than the sum of its proper divisors (4424253).

190240987 is an equidigital number, since it uses as much as digits as its factorization.

190240987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424252.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 190240987 is about 13792.7874992693. The cubic root of 190240987 is about 575.1326594986.

The spelling of 190240987 in words is "one hundred ninety million, two hundred forty thousand, nine hundred eighty-seven".