515207440 has 80 divisors (see below), whose sum is σ = 1383661440. Its totient is φ = 176322560.

The previous prime is 515207437. The next prime is 515207471. The reversal of 515207440 is 44702515.

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

It is a junction number, because it is equal to n+sod(n) for n = 515207399 and 515207408.

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, 2260 + ... + 32179.

It is an arithmetic number, because the mean of its divisors is an integer number (17295768).

Almost surely, 2^515207440 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 515207440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691830720).

515207440 is an abundant number, since it is smaller than the sum of its proper divisors (868454000).

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

515207440 is a wasteful number, since it uses less digits than its factorization.

515207440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34480 (or 34474 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 515207440 is about 22698.1814249512. The cubic root of 515207440 is about 801.6670653700.

Adding to 515207440 its reverse (44702515), we get a palindrome (559909955).

The spelling of 515207440 in words is "five hundred fifteen million, two hundred seven thousand, four hundred forty".