281040140 has 12 divisors (see below), whose sum is σ = 590184336. Its totient is φ = 112416048.

The previous prime is 281040127. The next prime is 281040167. The reversal of 281040140 is 41040182.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 14052007 = 281040140 / (2 + 8 + 1 + 0 + 4 + 0 + 1 + 4 + 0).

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, 7025984 + ... + 7026023.

It is an arithmetic number, because the mean of its divisors is an integer number (49182028).

Almost surely, 2^281040140 is an apocalyptic number.

281040140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281040140 is an abundant number, since it is smaller than the sum of its proper divisors (309144196).

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

281040140 is a wasteful number, since it uses less digits than its factorization.

281040140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14052016 (or 14052014 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 281040140 is about 16764.2518473089. The cubic root of 281040140 is about 655.0223483624.

The spelling of 281040140 in words is "two hundred eighty-one million, forty thousand, one hundred forty".