2115857136 has 80 divisors (see below), whose sum is σ = 5794930688. Its totient is φ = 664070400.

The previous prime is 2115857131. The next prime is 2115857153. The reversal of 2115857136 is 6317585112.

It is a junction number, because it is equal to n+sod(n) for n = 2115857094 and 2115857103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115857131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35841 + ... + 74271.

Almost surely, 2^2115857136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115857136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2897465344).

2115857136 is an abundant number, since it is smaller than the sum of its proper divisors (3679073552).

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

2115857136 is a wasteful number, since it uses less digits than its factorization.

2115857136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38510 (or 38504 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 2115857136 is about 45998.4471042230. The cubic root of 2115857136 is about 1283.7943110506.

The spelling of 2115857136 in words is "two billion, one hundred fifteen million, eight hundred fifty-seven thousand, one hundred thirty-six".