869945 has 8 divisors (see below), whose sum is σ = 1049544. Its totient is φ = 692224.

The previous prime is 869927. The next prime is 869951. The reversal of 869945 is 549968.

869945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 620944 + 249001 = 788^2 + 499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 869945 - 2⁸ = 869689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947 + ... + 1623.

It is an arithmetic number, because the mean of its divisors is an integer number (131193).

2⁸⁶⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

869945 is a deficient number, since it is larger than the sum of its proper divisors (179599).

869945 is a wasteful number, since it uses less digits than its factorization.

869945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its digits is 77760, while the sum is 41.

The square root of 869945 is about 932.7084217482. The cubic root of 869945 is about 95.4620153571.

The spelling of 869945 in words is "eight hundred sixty-nine thousand, nine hundred forty-five".