1215042520 has 32 divisors (see below), whose sum is σ = 2822037120. Its totient is φ = 470338560.

The previous prime is 1215042509. The next prime is 1215042527. The reversal of 1215042520 is 252405121.

It is a junction number, because it is equal to n+sod(n) for n = 1215042491 and 1215042500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215042527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488697 + ... + 491176.

It is an arithmetic number, because the mean of its divisors is an integer number (88188660).

Almost surely, 2^1215042520 is an apocalyptic number.

1215042520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215042520 is an abundant number, since it is smaller than the sum of its proper divisors (1606994600).

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

1215042520 is a wasteful number, since it uses less digits than its factorization.

1215042520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979915 (or 979911 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1215042520 is about 34857.4600336858. The cubic root of 1215042520 is about 1067.0804388646.

Adding to 1215042520 its reverse (252405121), we get a palindrome (1467447641).

The spelling of 1215042520 in words is "one billion, two hundred fifteen million, forty-two thousand, five hundred twenty".