2185278912 has 140 divisors (see below), whose sum is σ = 6616415520. Its totient is φ = 712848384.

The previous prime is 2185278857. The next prime is 2185278913. The reversal of 2185278912 is 2198725812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185278913) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 239164 + ... + 248132.

Almost surely, 2^2185278912 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 2185278912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3308207760).

2185278912 is an abundant number, since it is smaller than the sum of its proper divisors (4431136608).

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

2185278912 is an equidigital number, since it uses as much as digits as its factorization.

2185278912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9040 (or 9021 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 2185278912 is about 46746.9668748679. The cubic root of 2185278912 is about 1297.6840248190.

The spelling of 2185278912 in words is "two billion, one hundred eighty-five million, two hundred seventy-eight thousand, nine hundred twelve".