265249138 has 32 divisors (see below), whose sum is σ = 513164160. Its totient is φ = 99778560.

The previous prime is 265249123. The next prime is 265249151. The reversal of 265249138 is 831942562.

It is a self number, because there is not a number n which added to its sum of digits gives 265249138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25231 + ... + 34162.

It is an arithmetic number, because the mean of its divisors is an integer number (16036380).

Almost surely, 2^265249138 is an apocalyptic number.

265249138 is a deficient number, since it is larger than the sum of its proper divisors (247915022).

265249138 is a wasteful number, since it uses less digits than its factorization.

265249138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59442.

The product of its digits is 103680, while the sum is 40.

The square root of 265249138 is about 16286.4710112412. The cubic root of 265249138 is about 642.5170554704.

The spelling of 265249138 in words is "two hundred sixty-five million, two hundred forty-nine thousand, one hundred thirty-eight".