10001520 has 120 divisors (see below), whose sum is σ = 34819200. Its totient is φ = 2569728.

The previous prime is 10001501. The next prime is 10001521. The reversal of 10001520 is 2510001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20641 + ... + 21119.

It is an arithmetic number, because the mean of its divisors is an integer number (290160).

Almost surely, 2^10001520 is an apocalyptic number.

10001520 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 10001520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17409600).

10001520 is an abundant number, since it is smaller than the sum of its proper divisors (24817680).

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

10001520 is a wasteful number, since it uses less digits than its factorization.

10001520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 10001520 is about 3162.5179841386. The cubic root of 10001520 is about 215.4543842526.

Adding to 10001520 its reverse (2510001), we get a palindrome (12511521).

The spelling of 10001520 in words is "ten million, one thousand, five hundred twenty".