281972340 has 144 divisors (see below), whose sum is σ = 955438848. Its totient is φ = 69393024.

The previous prime is 281972333. The next prime is 281972351. The reversal of 281972340 is 43279182.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 281972295 and 281972304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60949 + ... + 65411.

It is an arithmetic number, because the mean of its divisors is an integer number (6634992).

Almost surely, 2^281972340 is an apocalyptic number.

281972340 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 281972340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (477719424).

281972340 is an abundant number, since it is smaller than the sum of its proper divisors (673466508).

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

281972340 is a wasteful number, since it uses less digits than its factorization.

281972340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500 (or 4486 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 281972340 is about 16792.0320390357. The cubic root of 281972340 is about 655.7457775835.

The spelling of 281972340 in words is "two hundred eighty-one million, nine hundred seventy-two thousand, three hundred forty".