2218137940 has 24 divisors (see below), whose sum is σ = 4860616320. Its totient is φ = 848678688.

The previous prime is 2218137839. The next prime is 2218137983. The reversal of 2218137940 is 497318122.

It is a self number, because there is not a number n which added to its sum of digits gives 2218137940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2410560 + ... + 2411479.

It is an arithmetic number, because the mean of its divisors is an integer number (202525680).

Almost surely, 2^2218137940 is an apocalyptic number.

2218137940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218137940 is an abundant number, since it is smaller than the sum of its proper divisors (2642478380).

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

2218137940 is a wasteful number, since it uses less digits than its factorization.

2218137940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4822071 (or 4822069 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 2218137940 is about 47097.1118010436. Note that the first 3 decimals coincide. The cubic root of 2218137940 is about 1304.1559188835.

The spelling of 2218137940 in words is "two billion, two hundred eighteen million, one hundred thirty-seven thousand, nine hundred forty".