1215755140 has 24 divisors (see below), whose sum is σ = 2588062680. Its totient is φ = 479639808.

The previous prime is 1215755131. The next prime is 1215755141. The reversal of 1215755140 is 415575121.

It can be written as a sum of positive squares in 4 ways, for example, as 334377796 + 881377344 = 18286^2 + 29688^2 .

It is not an unprimeable number, because it can be changed into a prime (1215755141) 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, 414895 + ... + 417814.

It is an arithmetic number, because the mean of its divisors is an integer number (107835945).

Almost surely, 2^1215755140 is an apocalyptic number.

1215755140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215755140 is an abundant number, since it is smaller than the sum of its proper divisors (1372307540).

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

1215755140 is a wasteful number, since it uses less digits than its factorization.

1215755140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832791 (or 832789 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 1215755140 is about 34867.6804505261. The cubic root of 1215755140 is about 1067.2890116062.

The spelling of 1215755140 in words is "one billion, two hundred fifteen million, seven hundred fifty-five thousand, one hundred forty".