393289 has 4 divisors (see below), whose sum is σ = 423556. Its totient is φ = 363024.

The previous prime is 393287. The next prime is 393299. The reversal of 393289 is 982393.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 233289 + 160000 = 483^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 393289 - 2¹ = 393287 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15114 + ... + 15139.

It is an arithmetic number, because the mean of its divisors is an integer number (105889).

2³⁹³²⁸⁹ is an apocalyptic number.

It is an amenable number.

393289 is a deficient number, since it is larger than the sum of its proper divisors (30267).

393289 is a wasteful number, since it uses less digits than its factorization.

393289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30266.

The product of its digits is 11664, while the sum is 34.

The square root of 393289 is about 627.1275787270. The cubic root of 393289 is about 73.2662448876.

It can be divided in two parts, 39 and 3289, that multiplied together give a triangular number (128271 = T₅₀₆).

The spelling of 393289 in words is "three hundred ninety-three thousand, two hundred eighty-nine".