515232420 has 24 divisors (see below), whose sum is σ = 1442650944. Its totient is φ = 137395296.

The previous prime is 515232397. The next prime is 515232449. The reversal of 515232420 is 24232515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4293544 + ... + 4293663.

It is an arithmetic number, because the mean of its divisors is an integer number (60110456).

Almost surely, 2^515232420 is an apocalyptic number.

It is an amenable number.

515232420 is an abundant number, since it is smaller than the sum of its proper divisors (927418524).

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

515232420 is a wasteful number, since it uses less digits than its factorization.

515232420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8587219 (or 8587217 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 515232420 is about 22698.7316826293. The cubic root of 515232420 is about 801.6800215232.

Adding to 515232420 its reverse (24232515), we get a palindrome (539464935).

The spelling of 515232420 in words is "five hundred fifteen million, two hundred thirty-two thousand, four hundred twenty".