2188274840 has 64 divisors (see below), whose sum is σ = 5189184000. Its totient is φ = 828213120.

The previous prime is 2188274819. The next prime is 2188274843. The reversal of 2188274840 is 484728812.

It is a Cunningham number, because it is equal to 46779²-1.

It is a junction number, because it is equal to n+sod(n) for n = 2188274791 and 2188274800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188274843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 934391 + ... + 936729.

It is an arithmetic number, because the mean of its divisors is an integer number (81081000).

Almost surely, 2^2188274840 is an apocalyptic number.

2188274840 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 2188274840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594592000).

2188274840 is an abundant number, since it is smaller than the sum of its proper divisors (3000909160).

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

2188274840 is a wasteful number, since it uses less digits than its factorization.

2188274840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600 (or 3596 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 44.

The square root of 2188274840 is about 46778.9999893114. Note that the first 4 decimals coincide. The cubic root of 2188274840 is about 1298.2767779269.

The spelling of 2188274840 in words is "two billion, one hundred eighty-eight million, two hundred seventy-four thousand, eight hundred forty".