284440 has 32 divisors (see below), whose sum is σ = 690480. Its totient is φ = 104832.

The previous prime is 284429. The next prime is 284447. The reversal of 284440 is 44482.

284440 is nontrivially palindromic in base 3.

It is a super-2 number, since 2×284440² = 161812227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247 + ... + 793.

2²⁸⁴⁴⁴⁰ is an apocalyptic number.

284440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 284440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345240).

284440 is an abundant number, since it is smaller than the sum of its proper divisors (406040).

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

284440 is a wasteful number, since it uses less digits than its factorization.

284440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 284440 is about 533.3291666504. The cubic root of 284440 is about 65.7653127842.

The spelling of 284440 in words is "two hundred eighty-four thousand, four hundred forty".