393665 has 8 divisors (see below), whose sum is σ = 483648. Its totient is φ = 307440.

The previous prime is 393649. The next prime is 393667. The reversal of 393665 is 566393.

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

It is not a de Polignac number, because 393665 - 2⁴ = 393649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 393665.

It is not an unprimeable number, because it can be changed into a prime (393667) 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, 701 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (60456).

2³⁹³⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

393665 is a deficient number, since it is larger than the sum of its proper divisors (89983).

393665 is a wasteful number, since it uses less digits than its factorization.

393665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879.

The product of its digits is 14580, while the sum is 32.

The square root of 393665 is about 627.4272866237. The cubic root of 393665 is about 73.2895859368.

The spelling of 393665 in words is "three hundred ninety-three thousand, six hundred sixty-five".