281397216 has 24 divisors (see below), whose sum is σ = 738667944. Its totient is φ = 93799040.

The previous prime is 281397197. The next prime is 281397217. The reversal of 281397216 is 612793182.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281397217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1465515 + ... + 1465706.

It is an arithmetic number, because the mean of its divisors is an integer number (30777831).

Almost surely, 2^281397216 is an apocalyptic number.

It is an amenable number.

281397216 is an abundant number, since it is smaller than the sum of its proper divisors (457270728).

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

281397216 is a wasteful number, since it uses less digits than its factorization.

281397216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931234 (or 2931226 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 281397216 is about 16774.8983901543. The cubic root of 281397216 is about 655.2996441873.

The spelling of 281397216 in words is "two hundred eighty-one million, three hundred ninety-seven thousand, two hundred sixteen".