1001520 has 120 divisors (see below), whose sum is σ = 3656016. Its totient is φ = 244224.

The previous prime is 1001501. The next prime is 1001527. The reversal of 1001520 is 251001.

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 not an unprimeable number, because it can be changed into a prime (1001527) 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, 9307 + ... + 9413.

2^1001520 is an apocalyptic number.

1001520 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 1001520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828008).

1001520 is an abundant number, since it is smaller than the sum of its proper divisors (2654496).

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

1001520 is a wasteful number, since it uses less digits than its factorization.

1001520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 130 counting only the distinct ones).

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

The square root of 1001520 is about 1000.7597114193. The cubic root of 1001520 is about 100.0506410172.

Adding to 1001520 its reverse (251001), we get a palindrome (1252521).

It can be divided in two parts, 1001 and 520, that added together give a square (1521 = 39²).

The spelling of 1001520 in words is "one million, one thousand, five hundred twenty".