1904816465 has 4 divisors (see below), whose sum is σ = 2285779764. Its totient is φ = 1523853168.

The previous prime is 1904816437. The next prime is 1904816491. The reversal of 1904816465 is 5646184091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5646184091 = 8849 ⋅638059.

It can be written as a sum of positive squares in 2 ways, for example, as 1195499776 + 709316689 = 34576^2 + 26633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904816465 - 2⁸ = 1904816209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190481642 + ... + 190481651.

It is an arithmetic number, because the mean of its divisors is an integer number (571444941).

Almost surely, 2^1904816465 is an apocalyptic number.

It is an amenable number.

1904816465 is a deficient number, since it is larger than the sum of its proper divisors (380963299).

1904816465 is an equidigital number, since it uses as much as digits as its factorization.

1904816465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380963298.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1904816465 is about 43644.2031087749. The cubic root of 1904816465 is about 1239.6080240852.

The spelling of 1904816465 in words is "one billion, nine hundred four million, eight hundred sixteen thousand, four hundred sixty-five".