385647521 has 8 divisors (see below), whose sum is σ = 450990144. Its totient is φ = 322867440.

The previous prime is 385647487. The next prime is 385647529. The reversal of 385647521 is 125746583.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-385647521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (385647529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640310 + ... + 640911.

It is an arithmetic number, because the mean of its divisors is an integer number (56373768).

Almost surely, 2^385647521 is an apocalyptic number.

It is an amenable number.

385647521 is a deficient number, since it is larger than the sum of its proper divisors (65342623).

385647521 is a wasteful number, since it uses less digits than its factorization.

385647521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281271.

The product of its digits is 201600, while the sum is 41.

The square root of 385647521 is about 19637.9103012515. The cubic root of 385647521 is about 727.8862486049.

The spelling of 385647521 in words is "three hundred eighty-five million, six hundred forty-seven thousand, five hundred twenty-one".