1905232809 has 16 divisors (see below), whose sum is σ = 2707865600. Its totient is φ = 1188070416.

The previous prime is 1905232799. The next prime is 1905232859. The reversal of 1905232809 is 9082325091.

It is not a de Polignac number, because 1905232809 - 2¹³ = 1905224617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1905232859) 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, 207049 + ... + 216054.

It is an arithmetic number, because the mean of its divisors is an integer number (169241600).

Almost surely, 2^1905232809 is an apocalyptic number.

1905232809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1905232809 is a deficient number, since it is larger than the sum of its proper divisors (802632791).

1905232809 is a wasteful number, since it uses less digits than its factorization.

1905232809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423204.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 1905232809 is about 43648.9725995928. The cubic root of 1905232809 is about 1239.6983330074.

The spelling of 1905232809 in words is "one billion, nine hundred five million, two hundred thirty-two thousand, eight hundred nine".