393281 has 8 divisors (see below), whose sum is σ = 473280. Its totient is φ = 319248.

The previous prime is 393271. The next prime is 393287. The reversal of 393281 is 182393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 393281 - 2¹⁴ = 376897 is a prime.

It is a super-2 number, since 2×393281² = 309339889922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393281.

It is not an unprimeable number, because it can be changed into a prime (393287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (59160).

2³⁹³²⁸¹ is an apocalyptic number.

It is an amenable number.

393281 is a deficient number, since it is larger than the sum of its proper divisors (79999).

393281 is a wasteful number, since it uses less digits than its factorization.

393281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983.

The product of its digits is 1296, while the sum is 26.

The square root of 393281 is about 627.1212004071. The cubic root of 393281 is about 73.2657481080.

The spelling of 393281 in words is "three hundred ninety-three thousand, two hundred eighty-one".