393921604709 has 16 divisors (see below), whose sum is σ = 417882164736. Its totient is φ = 370677384000.

The previous prime is 393921604679. The next prime is 393921604799. The reversal of 393921604709 is 907406129393.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 393921604709 - 2¹⁶ = 393921539173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393921604799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1724234 + ... + 1939284.

It is an arithmetic number, because the mean of its divisors is an integer number (26117635296).

Almost surely, 2^393921604709 is an apocalyptic number.

It is an amenable number.

393921604709 is a deficient number, since it is larger than the sum of its proper divisors (23960560027).

393921604709 is a wasteful number, since it uses less digits than its factorization.

393921604709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216716.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The spelling of 393921604709 in words is "three hundred ninety-three billion, nine hundred twenty-one million, six hundred four thousand, seven hundred nine".