389448993 has 4 divisors (see below), whose sum is σ = 519265328. Its totient is φ = 259632660.

The previous prime is 389448991. The next prime is 389449051. The reversal of 389448993 is 399844983.

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 not a de Polignac number, because 389448993 - 2¹ = 389448991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389448991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64908163 + ... + 64908168.

It is an arithmetic number, because the mean of its divisors is an integer number (129816332).

Almost surely, 2^389448993 is an apocalyptic number.

It is an amenable number.

389448993 is a deficient number, since it is larger than the sum of its proper divisors (129816335).

389448993 is a wasteful number, since it uses less digits than its factorization.

389448993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129816334.

The product of its digits is 6718464, while the sum is 57.

The square root of 389448993 is about 19734.4620651286. The cubic root of 389448993 is about 730.2701152142.

The spelling of 389448993 in words is "three hundred eighty-nine million, four hundred forty-eight thousand, nine hundred ninety-three".