1215403215 has 48 divisors (see below), whose sum is σ = 2114906112. Its totient is φ = 595750272.

The previous prime is 1215403201. The next prime is 1215403327. The reversal of 1215403215 is 5123045121.

It is a happy number.

It is not a de Polignac number, because 1215403215 - 2⁴ = 1215403199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 665794 + ... + 667616.

It is an arithmetic number, because the mean of its divisors is an integer number (44060544).

Almost surely, 2^1215403215 is an apocalyptic number.

1215403215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215403215 is a deficient number, since it is larger than the sum of its proper divisors (899502897).

1215403215 is a wasteful number, since it uses less digits than its factorization.

1215403215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1215403215 is about 34862.6335063776. The cubic root of 1215403215 is about 1067.1860188458.

Adding to 1215403215 its reverse (5123045121), we get a palindrome (6338448336).

The spelling of 1215403215 in words is "one billion, two hundred fifteen million, four hundred three thousand, two hundred fifteen".