869890 has 48 divisors (see below), whose sum is σ = 1945152. Its totient is φ = 274176.

The previous prime is 869887. The next prime is 869893. The reversal of 869890 is 98968.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (869887) and next prime (869893).

It is a super-2 number, since 2×869890² = 1513417224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (869893) 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 23 ways as a sum of consecutive naturals, for example, 20209 + ... + 20251.

It is an arithmetic number, because the mean of its divisors is an integer number (40524).

2⁸⁶⁹⁸⁹⁰ is an apocalyptic number.

869890 is an abundant number, since it is smaller than the sum of its proper divisors (1075262).

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

869890 is a wasteful number, since it uses less digits than its factorization.

869890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 869890 is about 932.6789372555. The cubic root of 869890 is about 95.4600035359.

The spelling of 869890 in words is "eight hundred sixty-nine thousand, eight hundred ninety".