2218237840 has 480 divisors, whose sum is σ = 7124544000. Its totient is φ = 634023936.

The previous prime is 2218237837. The next prime is 2218237849. The reversal of 2218237840 is 487328122.

It is a super-2 number, since 2×2218237840² = 9841158229615731200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2218237840.

It is not an unprimeable number, because it can be changed into a prime (2218237849) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28078921 + ... + 28078999.

It is an arithmetic number, because the mean of its divisors is an integer number (14842800).

Almost surely, 2^2218237840 is an apocalyptic number.

2218237840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2218237840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3562272000).

2218237840 is an abundant number, since it is smaller than the sum of its proper divisors (4906306160).

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

2218237840 is a wasteful number, since it uses less digits than its factorization.

2218237840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 2218237840 is about 47098.1723636916. The cubic root of 2218237840 is about 1304.1754973504.

The spelling of 2218237840 in words is "two billion, two hundred eighteen million, two hundred thirty-seven thousand, eight hundred forty".