515221040 has 80 divisors (see below), whose sum is σ = 1290051360. Its totient is φ = 190648320.

The previous prime is 515221039. The next prime is 515221117. The reversal of 515221040 is 40122515.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77030 + ... + 83450.

It is an arithmetic number, because the mean of its divisors is an integer number (16125642).

Almost surely, 2^515221040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 515221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645025680).

515221040 is an abundant number, since it is smaller than the sum of its proper divisors (774830320).

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

515221040 is a wasteful number, since it uses less digits than its factorization.

515221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510 (or 6504 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 515221040 is about 22698.4810064462. The cubic root of 515221040 is about 801.6741192123.

Adding to 515221040 its reverse (40122515), we get a palindrome (555343555).

The spelling of 515221040 in words is "five hundred fifteen million, two hundred twenty-one thousand, forty".