1809868319 has 16 divisors (see below), whose sum is σ = 2136662016. Its totient is φ = 1500206400.

The previous prime is 1809868301. The next prime is 1809868343. The reversal of 1809868319 is 9138689081.

It is not a de Polignac number, because 1809868319 - 2⁸ = 1809868063 is a prime.

It is a super-2 number, since 2×1809868319² = 6551246664239771522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809868519) 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, 496634 + ... + 500264.

It is an arithmetic number, because the mean of its divisors is an integer number (133541376).

Almost surely, 2^1809868319 is an apocalyptic number.

1809868319 is a deficient number, since it is larger than the sum of its proper divisors (326793697).

1809868319 is a wasteful number, since it uses less digits than its factorization.

1809868319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966.

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 1809868319 is about 42542.5471616357. The cubic root of 1809868319 is about 1218.6593530337.

The spelling of 1809868319 in words is "one billion, eight hundred nine million, eight hundred sixty-eight thousand, three hundred nineteen".