283890 has 16 divisors (see below), whose sum is σ = 681408. Its totient is φ = 75696.

The previous prime is 283873. The next prime is 283909. The reversal of 283890 is 98382.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 9463 = 283890 / (2 + 8 + 3 + 8 + 9 + 0).

It is an unprimeable number.

283890 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 7 ways as a sum of consecutive naturals, for example, 4702 + ... + 4761.

It is an arithmetic number, because the mean of its divisors is an integer number (42588).

2²⁸³⁸⁹⁰ is an apocalyptic number.

283890 is an abundant number, since it is smaller than the sum of its proper divisors (397518).

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

283890 is a wasteful number, since it uses less digits than its factorization.

283890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 283890 is about 532.8132881226. The cubic root of 283890 is about 65.7228969722.

The spelling of 283890 in words is "two hundred eighty-three thousand, eight hundred ninety".