393881 has 4 divisors (see below), whose sum is σ = 395472. Its totient is φ = 392292.

The previous prime is 393871. The next prime is 393901. The reversal of 393881 is 188393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 188393 = 23 ⋅8191.

It is a cyclic number.

It is not a de Polignac number, because 393881 - 2¹⁰ = 392857 is a prime.

It is a super-2 number, since 2×393881² = 310284484322, which contains 22 as substring.

It is a Duffinian number.

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

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, 335 + ... + 948.

It is an arithmetic number, because the mean of its divisors is an integer number (98868).

2³⁹³⁸⁸¹ is an apocalyptic number.

It is an amenable number.

393881 is a deficient number, since it is larger than the sum of its proper divisors (1591).

393881 is a wasteful number, since it uses less digits than its factorization.

393881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590.

The product of its digits is 5184, while the sum is 32.

The square root of 393881 is about 627.5993945185. The cubic root of 393881 is about 73.3029879039.

The spelling of 393881 in words is "three hundred ninety-three thousand, eight hundred eighty-one".