869940 has 72 divisors (see below), whose sum is σ = 2751840. Its totient is φ = 230688.

The previous prime is 869927. The next prime is 869951. The reversal of 869940 is 49968.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 869895 and 869904.

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 869940.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4771 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (38220).

2⁸⁶⁹⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 869940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375920).

869940 is an abundant number, since it is smaller than the sum of its proper divisors (1881900).

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

869940 is a wasteful number, since it uses less digits than its factorization.

869940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 869940 is about 932.7057413783. The cubic root of 869940 is about 95.4618324678.

The spelling of 869940 in words is "eight hundred sixty-nine thousand, nine hundred forty".