2115637992 has 144 divisors (see below), whose sum is σ = 6531782400. Its totient is φ = 616636800.

The previous prime is 2115637991. The next prime is 2115638033. The reversal of 2115637992 is 2997365112.

It is a happy number.

2115637992 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 637 + 9 + 9 + 2 = 666.

It is a super-2 number, since 2×2115637992² = 8951848226387584128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115637991) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 226617 + ... + 235767.

It is an arithmetic number, because the mean of its divisors is an integer number (45359600).

Almost surely, 2^2115637992 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 2115637992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3265891200).

2115637992 is an abundant number, since it is smaller than the sum of its proper divisors (4416144408).

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

2115637992 is a wasteful number, since it uses less digits than its factorization.

2115637992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9208 (or 9188 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 2115637992 is about 45996.0649621247. The cubic root of 2115637992 is about 1283.7499877156.

The spelling of 2115637992 in words is "two billion, one hundred fifteen million, six hundred thirty-seven thousand, nine hundred ninety-two".