2155430844 has 96 divisors (see below), whose sum is σ = 6542323200. Its totient is φ = 600808320.

The previous prime is 2155430843. The next prime is 2155430911. The reversal of 2155430844 is 4480345512.

It is a happy number.

2155430844 is a `hidden beast` number, since 21 + 554 + 3 + 0 + 84 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2155430799 and 2155430808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155430843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3774 + ... + 65765.

It is an arithmetic number, because the mean of its divisors is an integer number (68149200).

Almost surely, 2^2155430844 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 2155430844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3271161600).

2155430844 is an abundant number, since it is smaller than the sum of its proper divisors (4386892356).

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

2155430844 is a wasteful number, since it uses less digits than its factorization.

2155430844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69600 (or 69592 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 2155430844 is about 46426.6178393387. The cubic root of 2155430844 is about 1291.7486938811.

The spelling of 2155430844 in words is "two billion, one hundred fifty-five million, four hundred thirty thousand, eight hundred forty-four".