1809709864 has 16 divisors (see below), whose sum is σ = 3409290720. Its totient is φ = 900565680.

The previous prime is 1809709861. The next prime is 1809709873. The reversal of 1809709864 is 4689079081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1809709861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534364 + ... + 537739.

It is an arithmetic number, because the mean of its divisors is an integer number (213080670).

Almost surely, 2^1809709864 is an apocalyptic number.

It is an amenable number.

1809709864 is a deficient number, since it is larger than the sum of its proper divisors (1599580856).

1809709864 is a wasteful number, since it uses less digits than its factorization.

1809709864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072320 (or 1072316 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1809709864 is about 42540.6848087804. The cubic root of 1809709864 is about 1218.6237872227.

The spelling of 1809709864 in words is "one billion, eight hundred nine million, seven hundred nine thousand, eight hundred sixty-four".