393869 has 4 divisors (see below), whose sum is σ = 450144. Its totient is φ = 337596.

The previous prime is 393863. The next prime is 393871. The reversal of 393869 is 968393.

It is a happy number.

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: 968393 = 911 ⋅1063.

It is not a de Polignac number, because 393869 - 2⁴ = 393853 is a prime.

It is a super-2 number, since 2×393869² = 310265578322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393863) 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, 28127 + ... + 28140.

It is an arithmetic number, because the mean of its divisors is an integer number (112536).

2³⁹³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

393869 is a deficient number, since it is larger than the sum of its proper divisors (56275).

393869 is an equidigital number, since it uses as much as digits as its factorization.

393869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56274.

The product of its digits is 34992, while the sum is 38.

The square root of 393869 is about 627.5898342070. The cubic root of 393869 is about 73.3022434787.

The spelling of 393869 in words is "three hundred ninety-three thousand, eight hundred sixty-nine".