1903664809 has 8 divisors (see below), whose sum is σ = 1955896488. Its totient is φ = 1851709440.

The previous prime is 1903664803. The next prime is 1903664813. The reversal of 1903664809 is 9084663091.

It can be written as a sum of positive squares in 4 ways, for example, as 183738025 + 1719926784 = 13555^2 + 41472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1903664809 - 2²⁷ = 1769447081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1903664803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55072 + ... + 82705.

It is an arithmetic number, because the mean of its divisors is an integer number (244487061).

Almost surely, 2^1903664809 is an apocalyptic number.

It is an amenable number.

1903664809 is a deficient number, since it is larger than the sum of its proper divisors (52231679).

1903664809 is a wasteful number, since it uses less digits than its factorization.

1903664809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138155.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1903664809 is about 43631.0074259121. The cubic root of 1903664809 is about 1239.3581505232.

It can be divided in two parts, 19036 and 64809, that added together give a triangular number (83845 = T₄₀₉).

The spelling of 1903664809 in words is "one billion, nine hundred three million, six hundred sixty-four thousand, eight hundred nine".