1865920163 has 8 divisors (see below), whose sum is σ = 1967093760. Its totient is φ = 1767308040.

The previous prime is 1865920159. The next prime is 1865920193. The reversal of 1865920163 is 3610295681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1865920163 - 2² = 1865920159 is a prime.

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 1865920163.

It is not an unprimeable number, because it can be changed into a prime (1865920193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638873 + ... + 641786.

It is an arithmetic number, because the mean of its divisors is an integer number (245886720).

Almost surely, 2^1865920163 is an apocalyptic number.

1865920163 is a deficient number, since it is larger than the sum of its proper divisors (101173597).

1865920163 is a wasteful number, since it uses less digits than its factorization.

1865920163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280737.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1865920163 is about 43196.2980242520. The cubic root of 1865920163 is about 1231.1123440528.

The spelling of 1865920163 in words is "one billion, eight hundred sixty-five million, nine hundred twenty thousand, one hundred sixty-three".