1215830538 has 24 divisors (see below), whose sum is σ = 2836938468. Its totient is φ = 374101632.

The previous prime is 1215830537. The next prime is 1215830573. The reversal of 1215830538 is 8350385121.

1215830538 is a `hidden beast` number, since 1 + 21 + 583 + 0 + 53 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1200830409 + 15000129 = 34653^2 + 3873^2 .

It is not an unprimeable number, because it can be changed into a prime (1215830537) 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 11 ways as a sum of consecutive naturals, for example, 2597695 + ... + 2598162.

Almost surely, 2^1215830538 is an apocalyptic number.

1215830538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1215830538 is an abundant number, since it is smaller than the sum of its proper divisors (1621107930).

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

1215830538 is a wasteful number, since it uses less digits than its factorization.

1215830538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195878 (or 5195875 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1215830538 is about 34868.7616355958. The cubic root of 1215830538 is about 1067.3110746546.

The spelling of 1215830538 in words is "one billion, two hundred fifteen million, eight hundred thirty thousand, five hundred thirty-eight".