789990 has 32 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 198144.

The previous prime is 789979. The next prime is 790003. The reversal of 789990 is 99987.

It is a happy number.

789990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

789990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265 + ... + 1284.

It is an arithmetic number, because the mean of its divisors is an integer number (62775).

2⁷⁸⁹⁹⁹⁰ is an apocalyptic number.

789990 is an abundant number, since it is smaller than the sum of its proper divisors (1218810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

789990 is a wasteful number, since it uses less digits than its factorization.

789990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 789990 is about 888.8138162743. The cubic root of 789990 is about 92.4429645958.

The spelling of 789990 in words is "seven hundred eighty-nine thousand, nine hundred ninety".