1521320712 has 64 divisors (see below), whose sum is σ = 3944254080. Its totient is φ = 488581632.

The previous prime is 1521320711. The next prime is 1521320741. The reversal of 1521320712 is 2170231251.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1521320711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83148 + ... + 99780.

It is an arithmetic number, because the mean of its divisors is an integer number (61628970).

Almost surely, 2^1521320712 is an apocalyptic number.

1521320712 is a gapful number since it is divisible by the number (12) 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 1521320712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1972127040).

1521320712 is an abundant number, since it is smaller than the sum of its proper divisors (2422933368).

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

1521320712 is a wasteful number, since it uses less digits than its factorization.

1521320712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16782 (or 16778 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1521320712 is about 39004.1114755868. Note that the first 3 decimals coincide. The cubic root of 1521320712 is about 1150.1123297962.

Adding to 1521320712 its reverse (2170231251), we get a palindrome (3691551963).

The spelling of 1521320712 in words is "one billion, five hundred twenty-one million, three hundred twenty thousand, seven hundred twelve".