1521340520 has 96 divisors (see below), whose sum is σ = 4089899520. Its totient is φ = 498875520.

The previous prime is 1521340517. The next prime is 1521340537. The reversal of 1521340520 is 250431251.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142985 + ... + 153255.

It is an arithmetic number, because the mean of its divisors is an integer number (42603120).

Almost surely, 2^1521340520 is an apocalyptic number.

1521340520 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 1521340520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2044949760).

1521340520 is an abundant number, since it is smaller than the sum of its proper divisors (2568559000).

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

1521340520 is a wasteful number, since it uses less digits than its factorization.

1521340520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335 (or 10308 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1521340520 is about 39004.3653967091. The cubic root of 1521340520 is about 1150.1173213640.

Adding to 1521340520 its reverse (250431251), we get a palindrome (1771771771).

The spelling of 1521340520 in words is "one billion, five hundred twenty-one million, three hundred forty thousand, five hundred twenty".