2113643440 has 20 divisors (see below), whose sum is σ = 4914221184. Its totient is φ = 845457344.

The previous prime is 2113643437. The next prime is 2113643447. The reversal of 2113643440 is 443463112.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 2113643399 and 2113643408.

It is not an unprimeable number, because it can be changed into a prime (2113643447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13210192 + ... + 13210351.

Almost surely, 2^2113643440 is an apocalyptic number.

2113643440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2113643440 is an abundant number, since it is smaller than the sum of its proper divisors (2800577744).

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

2113643440 is a wasteful number, since it uses less digits than its factorization.

2113643440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26420556 (or 26420550 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 2113643440 is about 45974.3780817098. The cubic root of 2113643440 is about 1283.3464355027.

The spelling of 2113643440 in words is "two billion, one hundred thirteen million, six hundred forty-three thousand, four hundred forty".