1521314340 has 144 divisors (see below), whose sum is σ = 5271735168. Its totient is φ = 320965632.

The previous prime is 1521314321. The next prime is 1521314359. The reversal of 1521314340 is 434131251.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1521314321) and next prime (1521314359).

It is a self number, because there is not a number n which added to its sum of digits gives 1521314340.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60264 + ... + 81696.

It is an arithmetic number, because the mean of its divisors is an integer number (36609272).

Almost surely, 2^1521314340 is an apocalyptic number.

1521314340 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 1521314340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2635867584).

1521314340 is an abundant number, since it is smaller than the sum of its proper divisors (3750420828).

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

1521314340 is a wasteful number, since it uses less digits than its factorization.

1521314340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21478 (or 21463 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1521314340 is about 39004.0297918048. The cubic root of 1521314340 is about 1150.1107240585.

Adding to 1521314340 its reverse (434131251), we get a palindrome (1955445591).

The spelling of 1521314340 in words is "one billion, five hundred twenty-one million, three hundred fourteen thousand, three hundred forty".