393391669 has 8 divisors (see below), whose sum is σ = 429522912. Its totient is φ = 357321840.

The previous prime is 393391657. The next prime is 393391673. The reversal of 393391669 is 966193393.

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

It is a cyclic number.

It is not a de Polignac number, because 393391669 - 2⁹ = 393391157 is a prime.

It is a super-2 number, since 2×393391669² = 309514010477211122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393391619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1399 + ... + 28084.

It is an arithmetic number, because the mean of its divisors is an integer number (53690364).

Almost surely, 2^393391669 is an apocalyptic number.

It is an amenable number.

393391669 is a deficient number, since it is larger than the sum of its proper divisors (36131243).

393391669 is a wasteful number, since it uses less digits than its factorization.

393391669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30707.

The product of its digits is 708588, while the sum is 49.

The square root of 393391669 is about 19834.1036853194. The cubic root of 393391669 is about 732.7261977363.

The spelling of 393391669 in words is "three hundred ninety-three million, three hundred ninety-one thousand, six hundred sixty-nine".