1855396865 has 8 divisors (see below), whose sum is σ = 2544544320. Its totient is φ = 1272272112.

The previous prime is 1855396861. The next prime is 1855396871. The reversal of 1855396865 is 5686935581.

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 1855396865 - 2² = 1855396861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1855396865.

It is not an unprimeable number, because it can be changed into a prime (1855396861) 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, 26505635 + ... + 26505704.

It is an arithmetic number, because the mean of its divisors is an integer number (318068040).

Almost surely, 2^1855396865 is an apocalyptic number.

It is an amenable number.

1855396865 is a deficient number, since it is larger than the sum of its proper divisors (689147455).

1855396865 is an equidigital number, since it uses as much as digits as its factorization.

1855396865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53011351.

The product of its digits is 7776000, while the sum is 56.

The square root of 1855396865 is about 43074.3179284362. The cubic root of 1855396865 is about 1228.7935964692.

The spelling of 1855396865 in words is "one billion, eight hundred fifty-five million, three hundred ninety-six thousand, eight hundred sixty-five".