385583921 has 4 divisors (see below), whose sum is σ = 398022144. Its totient is φ = 373145700.

The previous prime is 385583917. The next prime is 385583923. The reversal of 385583921 is 129385583.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129385583 = 331 ⋅390893.

It is a cyclic number.

It is not a de Polignac number, because 385583921 - 2² = 385583917 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (385583923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6219065 + ... + 6219126.

It is an arithmetic number, because the mean of its divisors is an integer number (99505536).

Almost surely, 2^385583921 is an apocalyptic number.

385583921 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

385583921 is a deficient number, since it is larger than the sum of its proper divisors (12438223).

385583921 is a wasteful number, since it uses less digits than its factorization.

385583921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438222.

The product of its digits is 259200, while the sum is 44.

The square root of 385583921 is about 19636.2909175842. The cubic root of 385583921 is about 727.8462326940.

The spelling of 385583921 in words is "three hundred eighty-five million, five hundred eighty-three thousand, nine hundred twenty-one".