393923 has 4 divisors (see below), whose sum is σ = 403128. Its totient is φ = 384720.

The previous prime is 393919. The next prime is 393929. The reversal of 393923 is 329393.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 393923 - 2² = 393919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393929) 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, 4538 + ... + 4623.

It is an arithmetic number, because the mean of its divisors is an integer number (100782).

2³⁹³⁹²³ is an apocalyptic number.

393923 is a deficient number, since it is larger than the sum of its proper divisors (9205).

393923 is an equidigital number, since it uses as much as digits as its factorization.

393923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204.

The product of its digits is 4374, while the sum is 29.

The square root of 393923 is about 627.6328544619. The cubic root of 393923 is about 73.3055932729.

The spelling of 393923 in words is "three hundred ninety-three thousand, nine hundred twenty-three".