283840 has 28 divisors (see below), whose sum is σ = 676656. Its totient is φ = 113408.

The previous prime is 283837. The next prime is 283859. The reversal of 283840 is 48382.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124 + ... + 763.

2²⁸³⁸⁴⁰ is an apocalyptic number.

283840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

283840 is an abundant number, since it is smaller than the sum of its proper divisors (392816).

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

283840 is an equidigital number, since it uses as much as digits as its factorization.

283840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 283840 is about 532.7663653047. The cubic root of 283840 is about 65.7190382736.

The spelling of 283840 in words is "two hundred eighty-three thousand, eight hundred forty".