393878 has 8 divisors (see below), whose sum is σ = 611280. Its totient is φ = 190120.

The previous prime is 393871. The next prime is 393901. The reversal of 393878 is 878393.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393871) by changing a digit.

393878 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 3338 + ... + 3453.

It is an arithmetic number, because the mean of its divisors is an integer number (76410).

2³⁹³⁸⁷⁸ is an apocalyptic number.

393878 is a deficient number, since it is larger than the sum of its proper divisors (217402).

393878 is a wasteful number, since it uses less digits than its factorization.

393878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6822.

The product of its digits is 36288, while the sum is 38.

The square root of 393878 is about 627.5970044543. The cubic root of 393878 is about 73.3028017990.

The spelling of 393878 in words is "three hundred ninety-three thousand, eight hundred seventy-eight".