393986 has 4 divisors (see below), whose sum is σ = 590982. Its totient is φ = 196992.

The previous prime is 393977. The next prime is 393989. The reversal of 393986 is 689393.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 323761 + 70225 = 569^2 + 265^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (393989) by changing a digit.

393986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98495 + ... + 98498.

2³⁹³⁹⁸⁶ is an apocalyptic number.

393986 is a deficient number, since it is larger than the sum of its proper divisors (196996).

393986 is a wasteful number, since it uses less digits than its factorization.

393986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196995.

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

The square root of 393986 is about 627.6830410327. The cubic root of 393986 is about 73.3095009792.

The spelling of 393986 in words is "three hundred ninety-three thousand, nine hundred eighty-six".