2161389232 has 40 divisors (see below), whose sum is σ = 4437774000. Its totient is φ = 1016923392.

The previous prime is 2161389199. The next prime is 2161389233. The reversal of 2161389232 is 2329831612.

It is a junction number, because it is equal to n+sod(n) for n = 2161389191 and 2161389200.

It is not an unprimeable number, because it can be changed into a prime (2161389233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21438 + ... + 69154.

It is an arithmetic number, because the mean of its divisors is an integer number (110944350).

Almost surely, 2^2161389232 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 2161389232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2218887000).

2161389232 is an abundant number, since it is smaller than the sum of its proper divisors (2276384768).

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

2161389232 is a wasteful number, since it uses less digits than its factorization.

2161389232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47893 (or 47887 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 2161389232 is about 46490.7435087889. The cubic root of 2161389232 is about 1292.9378851467.

The spelling of 2161389232 in words is "two billion, one hundred sixty-one million, three hundred eighty-nine thousand, two hundred thirty-two".