385749521 has 8 divisors (see below), whose sum is σ = 388468224. Its totient is φ = 383038480.

The previous prime is 385749487. The next prime is 385749541. The reversal of 385749521 is 125947583.

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

It is a cyclic number.

It is not a de Polignac number, because 385749521 - 2¹⁰ = 385748497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385749541) 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, 128975 + ... + 131931.

It is an arithmetic number, because the mean of its divisors is an integer number (48558528).

Almost surely, 2^385749521 is an apocalyptic number.

It is an amenable number.

385749521 is a deficient number, since it is larger than the sum of its proper divisors (2718703).

385749521 is a wasteful number, since it uses less digits than its factorization.

385749521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831.

The product of its digits is 302400, while the sum is 44.

The square root of 385749521 is about 19640.5071472200. The cubic root of 385749521 is about 727.9504158808.

The spelling of 385749521 in words is "three hundred eighty-five million, seven hundred forty-nine thousand, five hundred twenty-one".