2115853840 has 40 divisors (see below), whose sum is σ = 4981645440. Its totient is φ = 835625856.

The previous prime is 2115853823. The next prime is 2115853841. The reversal of 2115853840 is 483585112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 2115853840.

It is not an unprimeable number, because it can be changed into a prime (2115853841) 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, 161074 + ... + 173713.

It is an arithmetic number, because the mean of its divisors is an integer number (124541136).

Almost surely, 2^2115853840 is an apocalyptic number.

2115853840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2115853840 is an abundant number, since it is smaller than the sum of its proper divisors (2865791600).

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

2115853840 is a wasteful number, since it uses less digits than its factorization.

2115853840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334879 (or 334873 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 2115853840 is about 45998.4112769126. The cubic root of 2115853840 is about 1283.7936444353.

The spelling of 2115853840 in words is "two billion, one hundred fifteen million, eight hundred fifty-three thousand, eight hundred forty".