281290940 has 48 divisors (see below), whose sum is σ = 681687552. Its totient is φ = 95501376.

The previous prime is 281290939. The next prime is 281290951. The reversal of 281290940 is 49092182.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 281290940.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4667 + ... + 24173.

It is an arithmetic number, because the mean of its divisors is an integer number (14201824).

Almost surely, 2^281290940 is an apocalyptic number.

281290940 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 281290940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340843776).

281290940 is an abundant number, since it is smaller than the sum of its proper divisors (400396612).

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

281290940 is a wasteful number, since it uses less digits than its factorization.

281290940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19626 (or 19624 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 281290940 is about 16771.7303818062. The cubic root of 281290940 is about 655.2171375736.

The spelling of 281290940 in words is "two hundred eighty-one million, two hundred ninety thousand, nine hundred forty".