2188231440 has 80 divisors (see below), whose sum is σ = 6843633408. Its totient is φ = 578357248.

The previous prime is 2188231421. The next prime is 2188231481. The reversal of 2188231440 is 441328812.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13224 + ... + 67463.

Almost surely, 2^2188231440 is an apocalyptic number.

2188231440 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 2188231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3421816704).

2188231440 is an abundant number, since it is smaller than the sum of its proper divisors (4655401968).

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

2188231440 is a wasteful number, since it uses less digits than its factorization.

2188231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80816 (or 80810 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 2188231440 is about 46778.5361036448. The cubic root of 2188231440 is about 1298.2681949732.

The spelling of 2188231440 in words is "two billion, one hundred eighty-eight million, two hundred thirty-one thousand, four hundred forty".