385506993 has 4 divisors (see below), whose sum is σ = 514009328. Its totient is φ = 257004660.

The previous prime is 385506973. The next prime is 385507009. The reversal of 385506993 is 399605583.

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 385506993 - 2¹³ = 385498801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385506973) 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, 64251163 + ... + 64251168.

It is an arithmetic number, because the mean of its divisors is an integer number (128502332).

Almost surely, 2^385506993 is an apocalyptic number.

It is an amenable number.

385506993 is a deficient number, since it is larger than the sum of its proper divisors (128502335).

385506993 is a wasteful number, since it uses less digits than its factorization.

385506993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128502334.

The product of its (nonzero) digits is 874800, while the sum is 48.

The square root of 385506993 is about 19634.3319978043. The cubic root of 385506993 is about 727.7978251784.

The spelling of 385506993 in words is "three hundred eighty-five million, five hundred six thousand, nine hundred ninety-three".