2165389426 has 4 divisors (see below), whose sum is σ = 3248084142. Its totient is φ = 1082694712.

The previous prime is 2165389423. The next prime is 2165389439. The reversal of 2165389426 is 6249835612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1214592201 + 950797225 = 34851^2 + 30835^2 .

It is a super-2 number, since 2×2165389426² = 9377822732465218952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2165389423) by changing a digit.

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 as a sum of consecutive naturals, namely, 541347355 + ... + 541347358.

Almost surely, 2^2165389426 is an apocalyptic number.

2165389426 is a deficient number, since it is larger than the sum of its proper divisors (1082694716).

2165389426 is a wasteful number, since it uses less digits than its factorization.

2165389426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082694715.

The product of its digits is 622080, while the sum is 46.

The square root of 2165389426 is about 46533.7450244444. The cubic root of 2165389426 is about 1293.7350290814.

The spelling of 2165389426 in words is "two billion, one hundred sixty-five million, three hundred eighty-nine thousand, four hundred twenty-six".