865978153 has 4 divisors (see below), whose sum is σ = 866037760. Its totient is φ = 865918548.

The previous prime is 865978123. The next prime is 865978163. The reversal of 865978153 is 351879568.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 865978153 - 2¹³ = 865969961 is a prime.

It is a super-2 number, since 2×865978153² = 1499836322946582818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 865978153.

It is not an unprimeable number, because it can be changed into a prime (865978123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7828 + ... + 42346.

It is an arithmetic number, because the mean of its divisors is an integer number (216509440).

Almost surely, 2^865978153 is an apocalyptic number.

It is an amenable number.

865978153 is a deficient number, since it is larger than the sum of its proper divisors (59607).

865978153 is a wasteful number, since it uses less digits than its factorization.

865978153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59606.

The product of its digits is 1814400, while the sum is 52.

The square root of 865978153 is about 29427.5067411427. The cubic root of 865978153 is about 953.1669572758.

The spelling of 865978153 in words is "eight hundred sixty-five million, nine hundred seventy-eight thousand, one hundred fifty-three".