393994499393 has 4 divisors (see below), whose sum is σ = 429812181168. Its totient is φ = 358176817620.

The previous prime is 393994499377. The next prime is 393994499407.

393994499393 is nontrivially palindromic in base 10.

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 393994499393 - 2⁴ = 393994499377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393994499393.

It is not an unprimeable number, because it can be changed into a prime (393994495393) 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, 17908840871 + ... + 17908840892.

It is an arithmetic number, because the mean of its divisors is an integer number (107453045292).

Almost surely, 2^393994499393 is an apocalyptic number.

It is an amenable number.

393994499393 is a deficient number, since it is larger than the sum of its proper divisors (35817681775).

393994499393 is a wasteful number, since it uses less digits than its factorization.

393994499393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35817681774.

The product of its digits is 688747536, while the sum is 74.

The spelling of 393994499393 in words is "three hundred ninety-three billion, nine hundred ninety-four million, four hundred ninety-nine thousand, three hundred ninety-three".