865638148 has 12 divisors (see below), whose sum is σ = 1525034700. Its totient is φ = 429913952.

The previous prime is 865638131. The next prime is 865638149. The reversal of 865638148 is 841836568.

It can be written as a sum of positive squares in 2 ways, for example, as 54641664 + 810996484 = 7392^2 + 28478^2 .

It is not an unprimeable number, because it can be changed into a prime (865638149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725611 + ... + 726802.

It is an arithmetic number, because the mean of its divisors is an integer number (127086225).

Almost surely, 2^865638148 is an apocalyptic number.

It is an amenable number.

865638148 is a deficient number, since it is larger than the sum of its proper divisors (659396552).

865638148 is a wasteful number, since it uses less digits than its factorization.

865638148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452566 (or 1452564 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 865638148 is about 29421.7291809982. The cubic root of 865638148 is about 953.0421951004.

The spelling of 865638148 in words is "eight hundred sixty-five million, six hundred thirty-eight thousand, one hundred forty-eight".