393389237849 has 8 divisors (see below), whose sum is σ = 398932687560. Its totient is φ = 387878112000.

The previous prime is 393389237821. The next prime is 393389237863. The reversal of 393389237849 is 948732983393.

It can be written as a sum of positive squares in 4 ways, for example, as 296812488025 + 96576749824 = 544805^2 + 310768^2 .

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 393389237849 - 2¹⁶ = 393389172313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393389237869) 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 7 ways as a sum of consecutive naturals, for example, 8056454 + ... + 8105135.

It is an arithmetic number, because the mean of its divisors is an integer number (49866585945).

Almost surely, 2^393389237849 is an apocalyptic number.

It is an amenable number.

393389237849 is a deficient number, since it is larger than the sum of its proper divisors (5543449711).

393389237849 is a wasteful number, since it uses less digits than its factorization.

393389237849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16161931.

The product of its digits is 211631616, while the sum is 68.

The spelling of 393389237849 in words is "three hundred ninety-three billion, three hundred eighty-nine million, two hundred thirty-seven thousand, eight hundred forty-nine".