393879 has 4 divisors (see below), whose sum is σ = 525176. Its totient is φ = 262584.

The previous prime is 393871. The next prime is 393901. The reversal of 393879 is 978393.

It is a happy number.

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

It is not a de Polignac number, because 393879 - 2³ = 393871 is a prime.

It is an Ulam number.

It is a D-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 (393871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65644 + ... + 65649.

It is an arithmetic number, because the mean of its divisors is an integer number (131294).

2³⁹³⁸⁷⁹ is an apocalyptic number.

393879 is a deficient number, since it is larger than the sum of its proper divisors (131297).

393879 is a wasteful number, since it uses less digits than its factorization.

393879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131296.

The product of its digits is 40824, while the sum is 39.

The square root of 393879 is about 627.5978011434. The cubic root of 393879 is about 73.3028638341.

The spelling of 393879 in words is "three hundred ninety-three thousand, eight hundred seventy-nine".