393644 has 6 divisors (see below), whose sum is σ = 688884. Its totient is φ = 196820.

The previous prime is 393637. The next prime is 393649. The reversal of 393644 is 446393.

It is a happy number.

393644 is nontrivially palindromic in base 3.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 393644.

It is not an unprimeable number, because it can be changed into a prime (393649) 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 as a sum of consecutive naturals, namely, 49202 + ... + 49209.

It is an arithmetic number, because the mean of its divisors is an integer number (114814).

2³⁹³⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

393644 is a deficient number, since it is larger than the sum of its proper divisors (295240).

393644 is a wasteful number, since it uses less digits than its factorization.

393644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98415 (or 98413 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 393644 is about 627.4105513936. The cubic root of 393644 is about 73.2882827064.

The spelling of 393644 in words is "three hundred ninety-three thousand, six hundred forty-four".