385521999 has 4 divisors (see below), whose sum is σ = 514029336. Its totient is φ = 257014664.

The previous prime is 385521959. The next prime is 385522051. The reversal of 385521999 is 999125583.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 385521999 - 2⁸ = 385521743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385521919) 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, 64253664 + ... + 64253669.

It is an arithmetic number, because the mean of its divisors is an integer number (128507334).

Almost surely, 2^385521999 is an apocalyptic number.

385521999 is a deficient number, since it is larger than the sum of its proper divisors (128507337).

385521999 is a wasteful number, since it uses less digits than its factorization.

385521999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128507336.

The product of its digits is 874800, while the sum is 51.

The square root of 385521999 is about 19634.7141308449. The cubic root of 385521999 is about 727.8072683209.

The spelling of 385521999 in words is "three hundred eighty-five million, five hundred twenty-one thousand, nine hundred ninety-nine".