393445 has 8 divisors (see below), whose sum is σ = 508536. Its totient is φ = 290496.

The previous prime is 393413. The next prime is 393451. The reversal of 393445 is 544393.

It can be written as a sum of positive squares in 4 ways, for example, as 6561 + 386884 = 81^2 + 622^2 .

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 393445 - 2⁵ = 393413 is a prime.

It is a Duffinian number.

393445 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2962 + ... + 3091.

It is an arithmetic number, because the mean of its divisors is an integer number (63567).

393445 is a Friedman number, since it can be written as (4*3^9-43)*5, using all its digits and the basic arithmetic operations.

2³⁹³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

393445 is a deficient number, since it is larger than the sum of its proper divisors (115091).

393445 is a wasteful number, since it uses less digits than its factorization.

393445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6071.

The product of its digits is 6480, while the sum is 28.

The square root of 393445 is about 627.2519430022. The cubic root of 393445 is about 73.2759307449.

It can be divided in two parts, 393 and 445, that added together give a palindrome (838).

The spelling of 393445 in words is "three hundred ninety-three thousand, four hundred forty-five".