787989 has 16 divisors (see below), whose sum is σ = 1118720. Its totient is φ = 492480.

The previous prime is 787981. The next prime is 787993. The reversal of 787989 is 989787.

It is not a de Polignac number, because 787989 - 2³ = 787981 is a prime.

It is a Duffinian number.

787989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3327 + ... + 3555.

It is an arithmetic number, because the mean of its divisors is an integer number (69920).

2⁷⁸⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

787989 is a deficient number, since it is larger than the sum of its proper divisors (330731).

787989 is a wasteful number, since it uses less digits than its factorization.

787989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300.

The product of its digits is 254016, while the sum is 48.

The square root of 787989 is about 887.6874449940. The cubic root of 787989 is about 92.3648476693.

The spelling of 787989 in words is "seven hundred eighty-seven thousand, nine hundred eighty-nine".