1819850465 has 16 divisors (see below), whose sum is σ = 2208996048. Its totient is φ = 1439133696.

The previous prime is 1819850441. The next prime is 1819850467. The reversal of 1819850465 is 5640589181.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 40360609 + 1779489856 = 6353^2 + 42184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1819850465 - 2⁸ = 1819850209 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1819850467) 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 15 ways as a sum of consecutive naturals, for example, 528389 + ... + 531821.

It is an arithmetic number, because the mean of its divisors is an integer number (138062253).

Almost surely, 2^1819850465 is an apocalyptic number.

It is an amenable number.

1819850465 is a deficient number, since it is larger than the sum of its proper divisors (389145583).

1819850465 is a wasteful number, since it uses less digits than its factorization.

1819850465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628.

The product of its (nonzero) digits is 345600, while the sum is 47.

The square root of 1819850465 is about 42659.7054021708. The cubic root of 1819850465 is about 1220.8957108016.

The spelling of 1819850465 in words is "one billion, eight hundred nineteen million, eight hundred fifty thousand, four hundred sixty-five".