393845 has 8 divisors (see below), whose sum is σ = 476064. Its totient is φ = 312784.

The previous prime is 393797. The next prime is 393847. The reversal of 393845 is 548393.

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 393845 - 2¹² = 389749 is a prime.

It is a super-2 number, since 2×393845² = 310227768050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393847) 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, 962 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (59508).

2³⁹³⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

393845 is a deficient number, since it is larger than the sum of its proper divisors (82219).

393845 is a wasteful number, since it uses less digits than its factorization.

393845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579.

The product of its digits is 12960, while the sum is 32.

The square root of 393845 is about 627.5707131471. The cubic root of 393845 is about 73.3007545830.

The spelling of 393845 in words is "three hundred ninety-three thousand, eight hundred forty-five".