869990 has 24 divisors (see below), whose sum is σ = 1723680. Its totient is φ = 315920.

The previous prime is 869989. The next prime is 870007. The reversal of 869990 is 99968.

869990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869990.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 851 + ... + 1569.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2⁸⁶⁹⁹⁹⁰ is an apocalyptic number.

869990 is a deficient number, since it is larger than the sum of its proper divisors (853690).

869990 is a wasteful number, since it uses less digits than its factorization.

869990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 869990 is about 932.7325447308. The cubic root of 869990 is about 95.4636613296.

The spelling of 869990 in words is "eight hundred sixty-nine thousand, nine hundred ninety".