2218237440 has 80 divisors (see below), whose sum is σ = 7091452368. Its totient is φ = 591527936.

The previous prime is 2218237423. The next prime is 2218237471. The reversal of 2218237440 is 447328122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 136737 + ... + 152096.

Almost surely, 2^2218237440 is an apocalyptic number.

2218237440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218237440 is an abundant number, since it is smaller than the sum of its proper divisors (4873214928).

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

2218237440 is an equidigital number, since it uses as much as digits as its factorization.

2218237440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288859 (or 288843 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 2218237440 is about 47098.1681172421. The cubic root of 2218237440 is about 1304.1754189593.

The spelling of 2218237440 in words is "two billion, two hundred eighteen million, two hundred thirty-seven thousand, four hundred forty".