2165258 has 4 divisors (see below), whose sum is σ = 3247890. Its totient is φ = 1082628.

The previous prime is 2165249. The next prime is 2165291. The reversal of 2165258 is 8525612.

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., 1471369 + 693889 = 1213^2 + 833^2 .

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2165258.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541313 + ... + 541316.

2^2165258 is an apocalyptic number.

2165258 is a deficient number, since it is larger than the sum of its proper divisors (1082632).

2165258 is a wasteful number, since it uses less digits than its factorization.

2165258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082631.

The product of its digits is 4800, while the sum is 29.

The square root of 2165258 is about 1471.4815663134. The cubic root of 2165258 is about 129.3708854596.

The spelling of 2165258 in words is "two million, one hundred sixty-five thousand, two hundred fifty-eight".