281040 has 40 divisors (see below), whose sum is σ = 871968. Its totient is φ = 74880.

The previous prime is 281033. The next prime is 281053. The reversal of 281040 is 40182.

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

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281040.

It is an unprimeable number.

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, 346 + ... + 825.

2²⁸¹⁰⁴⁰ is an apocalyptic number.

281040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281040 is an abundant number, since it is smaller than the sum of its proper divisors (590928).

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

281040 is a wasteful number, since it uses less digits than its factorization.

281040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 281040 is about 530.1320590193. The cubic root of 281040 is about 65.5022239596.

It can be divided in two parts, 2810 and 40, that added together give a triangular number (2850 = T₇₅).

The spelling of 281040 in words is "two hundred eighty-one thousand, forty".