2165396280 has 32 divisors (see below), whose sum is σ = 6496189200. Its totient is φ = 577438976.

The previous prime is 2165396257. The next prime is 2165396309. The reversal of 2165396280 is 826935612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9022365 + ... + 9022604.

Almost surely, 2^2165396280 is an apocalyptic number.

2165396280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165396280 is an abundant number, since it is smaller than the sum of its proper divisors (4330792920).

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

2165396280 is a wasteful number, since it uses less digits than its factorization.

2165396280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044983 (or 18044979 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 2165396280 is about 46533.8186698663. The cubic root of 2165396280 is about 1293.7363940785.

The spelling of 2165396280 in words is "two billion, one hundred sixty-five million, three hundred ninety-six thousand, two hundred eighty".