1904132905 has 4 divisors (see below), whose sum is σ = 2284959492. Its totient is φ = 1523306320.

The previous prime is 1904132903. The next prime is 1904132917. The reversal of 1904132905 is 5092314091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5092314091 = 59743 ⋅85237.

It can be written as a sum of positive squares in 2 ways, for example, as 283989904 + 1620143001 = 16852^2 + 40251^2 .

It is not a de Polignac number, because 1904132905 - 2¹ = 1904132903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1904132903) 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 3 ways as a sum of consecutive naturals, for example, 190413286 + ... + 190413295.

It is an arithmetic number, because the mean of its divisors is an integer number (571239873).

Almost surely, 2^1904132905 is an apocalyptic number.

It is an amenable number.

1904132905 is a deficient number, since it is larger than the sum of its proper divisors (380826587).

1904132905 is an equidigital number, since it uses as much as digits as its factorization.

1904132905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380826586.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1904132905 is about 43636.3713546395. The cubic root of 1904132905 is about 1239.4597249611.

Adding to 1904132905 its reverse (5092314091), we get a palindrome (6996446996).

The spelling of 1904132905 in words is "one billion, nine hundred four million, one hundred thirty-two thousand, nine hundred five".