393999353949893 has 4 divisors (see below), whose sum is σ = 398746334118048. Its totient is φ = 389252373781740.

The previous prime is 393999353949871. The next prime is 393999353949917. The reversal of 393999353949893 is 398949353999393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393999353949893 - 2⁶ = 393999353949829 is a prime.

It is a super-2 number, since 2×393999353949893² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 393999353949796 and 393999353949805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393999353949863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2373490083953 + ... + 2373490084118.

It is an arithmetic number, because the mean of its divisors is an integer number (99686583529512).

Almost surely, 2^{393999353949893} is an apocalyptic number.

It is an amenable number.

393999353949893 is a deficient number, since it is larger than the sum of its proper divisors (4746980168155).

393999353949893 is an equidigital number, since it uses as much as digits as its factorization.

393999353949893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746980168154.

The product of its digits is 185961834720, while the sum is 95.

The spelling of 393999353949893 in words is "three hundred ninety-three trillion, nine hundred ninety-nine billion, three hundred fifty-three million, nine hundred forty-nine thousand, eight hundred ninety-three".