385617520 has 20 divisors (see below), whose sum is σ = 896560920. Its totient is φ = 154246976.

The previous prime is 385617497. The next prime is 385617523. The reversal of 385617520 is 25716583.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 385617520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385617523) 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, 2410030 + ... + 2410189.

It is an arithmetic number, because the mean of its divisors is an integer number (44828046).

Almost surely, 2^385617520 is an apocalyptic number.

It is an amenable number.

385617520 is an abundant number, since it is smaller than the sum of its proper divisors (510943400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

385617520 is a wasteful number, since it uses less digits than its factorization.

385617520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820232 (or 4820226 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 385617520 is about 19637.1464322085. The cubic root of 385617520 is about 727.8673730943.

The spelling of 385617520 in words is "three hundred eighty-five million, six hundred seventeen thousand, five hundred twenty".