393646 has 16 divisors (see below), whose sum is σ = 667440. Its totient is φ = 172480.

The previous prime is 393637. The next prime is 393649. The reversal of 393646 is 646393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330 + ... + 946.

It is an arithmetic number, because the mean of its divisors is an integer number (41715).

2³⁹³⁶⁴⁶ is an apocalyptic number.

393646 is a deficient number, since it is larger than the sum of its proper divisors (273794).

393646 is a wasteful number, since it uses less digits than its factorization.

393646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 11664, while the sum is 31.

The square root of 393646 is about 627.4121452443. The cubic root of 393646 is about 73.2884068255.

The spelling of 393646 in words is "three hundred ninety-three thousand, six hundred forty-six".