2187845940 has 96 divisors (see below), whose sum is σ = 7412961024. Its totient is φ = 470661120.

The previous prime is 2187845921. The next prime is 2187845983. The reversal of 2187845940 is 495487812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2187845940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146071 + ... + 160350.

It is an arithmetic number, because the mean of its divisors is an integer number (77218344).

Almost surely, 2^2187845940 is an apocalyptic number.

2187845940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187845940 is an abundant number, since it is smaller than the sum of its proper divisors (5225115084).

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

2187845940 is a wasteful number, since it uses less digits than its factorization.

2187845940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306457 (or 306455 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 2187845940 is about 46774.4154426327. The cubic root of 2187845940 is about 1298.1919520048.

The spelling of 2187845940 in words is "two billion, one hundred eighty-seven million, eight hundred forty-five thousand, nine hundred forty".