281231340 has 192 divisors, whose sum is σ = 910393344. Its totient is φ = 64253952.

The previous prime is 281231329. The next prime is 281231351. The reversal of 281231340 is 43132182.

281231340 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (281231329) and next prime (281231351).

It is a self number, because there is not a number n which added to its sum of digits gives 281231340.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1683937 + ... + 1684103.

It is an arithmetic number, because the mean of its divisors is an integer number (4741632).

Almost surely, 2^281231340 is an apocalyptic number.

281231340 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 281231340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455196672).

281231340 is an abundant number, since it is smaller than the sum of its proper divisors (629162004).

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

281231340 is a wasteful number, since it uses less digits than its factorization.

281231340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 281231340 is about 16769.9534883076. The cubic root of 281231340 is about 655.1708584438.

The spelling of 281231340 in words is "two hundred eighty-one million, two hundred thirty-one thousand, three hundred forty".