2188581396 has 72 divisors (see below), whose sum is σ = 5317559520. Its totient is φ = 700554624.

The previous prime is 2188581371. The next prime is 2188581419. The reversal of 2188581396 is 6931858812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2310595 + ... + 2311541.

Almost surely, 2^2188581396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2188581396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2658779760).

2188581396 is an abundant number, since it is smaller than the sum of its proper divisors (3128978124).

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

2188581396 is a wasteful number, since it uses less digits than its factorization.

2188581396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241 (or 1210 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The square root of 2188581396 is about 46782.2765157917. The cubic root of 2188581396 is about 1298.3374004083.

The spelling of 2188581396 in words is "two billion, one hundred eighty-eight million, five hundred eighty-one thousand, three hundred ninety-six".