283440 has 40 divisors (see below), whose sum is σ = 879408. Its totient is φ = 75520.

The previous prime is 283411. The next prime is 283447. The reversal of 283440 is 44382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (283447) 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 7 ways as a sum of consecutive naturals, for example, 351 + ... + 830.

2²⁸³⁴⁴⁰ is an apocalyptic number.

283440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

283440 is an abundant number, since it is smaller than the sum of its proper divisors (595968).

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

283440 is a wasteful number, since it uses less digits than its factorization.

283440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1191 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 283440 is about 532.3908338805. The cubic root of 283440 is about 65.6881523595.

The spelling of 283440 in words is "two hundred eighty-three thousand, four hundred forty".