1215105672 has 32 divisors (see below), whose sum is σ = 3313925280. Its totient is φ = 368213760.

The previous prime is 1215105637. The next prime is 1215105677. The reversal of 1215105672 is 2765015121.

It is not an unprimeable number, because it can be changed into a prime (1215105677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301073 + ... + 2301600.

It is an arithmetic number, because the mean of its divisors is an integer number (103560165).

Almost surely, 2^1215105672 is an apocalyptic number.

1215105672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215105672 is an abundant number, since it is smaller than the sum of its proper divisors (2098819608).

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

1215105672 is a wasteful number, since it uses less digits than its factorization.

1215105672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602693 (or 4602689 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 1215105672 is about 34858.3658825252. The cubic root of 1215105672 is about 1067.0989257613.

The spelling of 1215105672 in words is "one billion, two hundred fifteen million, one hundred five thousand, six hundred seventy-two".