515215420 has 24 divisors (see below), whose sum is σ = 1082469024. Its totient is φ = 205987776.

The previous prime is 515215397. The next prime is 515215427. The reversal of 515215420 is 24512515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515215427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48729 + ... + 58351.

It is an arithmetic number, because the mean of its divisors is an integer number (45102876).

Almost surely, 2^515215420 is an apocalyptic number.

It is an amenable number.

515215420 is an abundant number, since it is smaller than the sum of its proper divisors (567253604).

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

515215420 is a wasteful number, since it uses less digits than its factorization.

515215420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12309 (or 12307 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 515215420 is about 22698.3572092784. The cubic root of 515215420 is about 801.6712043308.

Adding to 515215420 its reverse (24512515), we get a palindrome (539727935).

The spelling of 515215420 in words is "five hundred fifteen million, two hundred fifteen thousand, four hundred twenty".