840087987 has 4 divisors (see below), whose sum is σ = 1120117320. Its totient is φ = 560058656.

The previous prime is 840087977. The next prime is 840088027. The reversal of 840087987 is 789780048.

840087987 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.

It is a cyclic number.

It is not a de Polignac number, because 840087987 - 2²² = 835893683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840087977) 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, 140014662 + ... + 140014667.

It is an arithmetic number, because the mean of its divisors is an integer number (280029330).

Almost surely, 2^840087987 is an apocalyptic number.

840087987 is a deficient number, since it is larger than the sum of its proper divisors (280029333).

840087987 is a wasteful number, since it uses less digits than its factorization.

840087987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280029332.

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 840087987 is about 28984.2713725910. The cubic root of 840087987 is about 943.5717390195.

The spelling of 840087987 in words is "eight hundred forty million, eighty-seven thousand, nine hundred eighty-seven".