2165440304 has 10 divisors (see below), whose sum is σ = 4195540620. Its totient is φ = 1082720144.

The previous prime is 2165440283. The next prime is 2165440307. The reversal of 2165440304 is 4030445612.

It is a super-2 number, since 2×2165440304² = 9378263420375224832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2165440307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67669994 + ... + 67670025.

It is an arithmetic number, because the mean of its divisors is an integer number (419554062).

Almost surely, 2^2165440304 is an apocalyptic number.

It is an amenable number.

2165440304 is a deficient number, since it is larger than the sum of its proper divisors (2030100316).

2165440304 is a wasteful number, since it uses less digits than its factorization.

2165440304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135340027 (or 135340021 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 2165440304 is about 46534.2916997777. The cubic root of 2165440304 is about 1293.7451615368.

Adding to 2165440304 its reverse (4030445612), we get a palindrome (6195885916).

The spelling of 2165440304 in words is "two billion, one hundred sixty-five million, four hundred forty thousand, three hundred four".