283640 has 32 divisors (see below), whose sum is σ = 730080. Its totient is φ = 97152.

The previous prime is 283639. The next prime is 283669. The reversal of 283640 is 46382.

It is a happy number.

283640 is nontrivially palindromic in base 15.

283640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227 + ... + 786.

It is an arithmetic number, because the mean of its divisors is an integer number (22815).

2²⁸³⁶⁴⁰ is an apocalyptic number.

283640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

283640 is an abundant number, since it is smaller than the sum of its proper divisors (446440).

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

283640 is a wasteful number, since it uses less digits than its factorization.

283640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 283640 is about 532.5786326919. The cubic root of 283640 is about 65.7035989463.

The spelling of 283640 in words is "two hundred eighty-three thousand, six hundred forty".