393998 has 8 divisors (see below), whose sum is σ = 644760. Its totient is φ = 179080.

The previous prime is 393997. The next prime is 394007. The reversal of 393998 is 899393.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393997) 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, 8933 + ... + 8976.

It is an arithmetic number, because the mean of its divisors is an integer number (80595).

2³⁹³⁹⁹⁸ is an apocalyptic number.

393998 is a deficient number, since it is larger than the sum of its proper divisors (250762).

393998 is a wasteful number, since it uses less digits than its factorization.

393998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17922.

The product of its digits is 52488, while the sum is 41.

The square root of 393998 is about 627.6925999245. The cubic root of 393998 is about 73.3102452570.

The spelling of 393998 in words is "three hundred ninety-three thousand, nine hundred ninety-eight".