2181825396 has 30 divisors (see below), whose sum is σ = 5703723410. Its totient is φ = 727275024.

The previous prime is 2181825391. The next prime is 2181825431. The reversal of 2181825396 is 6935281812.

2181825396 is a `hidden beast` number, since 2 + 181 + 82 + 5 + 396 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2181824100 + 1296 = 46710^2 + 36^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181825391) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3366691 + ... + 3367338.

Almost surely, 2^2181825396 is an apocalyptic number.

It is an amenable number.

2181825396 is an abundant number, since it is smaller than the sum of its proper divisors (3521898014).

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

2181825396 is a wasteful number, since it uses less digits than its factorization.

2181825396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6734045 (or 6734034 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 2181825396 is about 46710.0138728303. The cubic root of 2181825396 is about 1297.0000640031. Note that the first 4 decimals are identical.

The spelling of 2181825396 in words is "two billion, one hundred eighty-one million, eight hundred twenty-five thousand, three hundred ninety-six".