515404240 has 160 divisors (see below), whose sum is σ = 1394910720. Its totient is φ = 175515648.

The previous prime is 515404199. The next prime is 515404243. The reversal of 515404240 is 42404515.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515404243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693309 + ... + 694051.

It is an arithmetic number, because the mean of its divisors is an integer number (8718192).

Almost surely, 2^515404240 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 515404240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697455360).

515404240 is an abundant number, since it is smaller than the sum of its proper divisors (879506480).

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

515404240 is a wasteful number, since it uses less digits than its factorization.

515404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 515404240 is about 22702.5161601088. The cubic root of 515404240 is about 801.7691265220.

Adding to 515404240 its reverse (42404515), we get a palindrome (557808755).

The spelling of 515404240 in words is "five hundred fifteen million, four hundred four thousand, two hundred forty".