16385520 has 80 divisors (see below), whose sum is σ = 51603840. Its totient is φ = 4300032.

The previous prime is 16385519. The next prime is 16385521. The reversal of 16385520 is 2558361.

16385520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16385519) and next prime (16385521).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16385521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15571 + ... + 16589.

It is an arithmetic number, because the mean of its divisors is an integer number (645048).

Almost surely, 2^16385520 is an apocalyptic number.

16385520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16385520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25801920).

16385520 is an abundant number, since it is smaller than the sum of its proper divisors (35218320).

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

16385520 is a wasteful number, since it uses less digits than its factorization.

16385520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 16385520 is about 4047.9031608970. The cubic root of 16385520 is about 253.9920224002.

The spelling of 16385520 in words is "sixteen million, three hundred eighty-five thousand, five hundred twenty".