1816843365 has 40 divisors (see below), whose sum is σ = 3428288160. Its totient is φ = 917980128.

The previous prime is 1816843361. The next prime is 1816843453. The reversal of 1816843365 is 5633486181.

It is not a de Polignac number, because 1816843365 - 2² = 1816843361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1816843365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816843361) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 110359 + ... + 125748.

It is an arithmetic number, because the mean of its divisors is an integer number (85707204).

Almost surely, 2^1816843365 is an apocalyptic number.

1816843365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1816843365 is a deficient number, since it is larger than the sum of its proper divisors (1611444795).

1816843365 is a wasteful number, since it uses less digits than its factorization.

1816843365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236143 (or 236134 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 1816843365 is about 42624.4456268935. The cubic root of 1816843365 is about 1220.2228753884. Note that the first 3 decimals are identical.

The spelling of 1816843365 in words is "one billion, eight hundred sixteen million, eight hundred forty-three thousand, three hundred sixty-five".