385191993 has 4 divisors (see below), whose sum is σ = 513589328. Its totient is φ = 256794660.

The previous prime is 385191991. The next prime is 385192009. The reversal of 385191993 is 399191583.

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 385191993 - 2¹ = 385191991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385191991) 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, 64198663 + ... + 64198668.

It is an arithmetic number, because the mean of its divisors is an integer number (128397332).

Almost surely, 2^385191993 is an apocalyptic number.

It is an amenable number.

385191993 is a deficient number, since it is larger than the sum of its proper divisors (128397335).

385191993 is a wasteful number, since it uses less digits than its factorization.

385191993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128397334.

The product of its digits is 262440, while the sum is 48.

The square root of 385191993 is about 19626.3086952183. The cubic root of 385191993 is about 727.5995418876.

The spelling of 385191993 in words is "three hundred eighty-five million, one hundred ninety-one thousand, nine hundred ninety-three".