1809446964 has 96 divisors (see below), whose sum is σ = 4693670016. Its totient is φ = 538928640.

The previous prime is 1809446941. The next prime is 1809446971. The reversal of 1809446964 is 4696449081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1309554 + ... + 1310934.

It is an arithmetic number, because the mean of its divisors is an integer number (48892396).

Almost surely, 2^1809446964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1809446964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2346835008).

1809446964 is an abundant number, since it is smaller than the sum of its proper divisors (2884223052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1809446964 is a wasteful number, since it uses less digits than its factorization.

1809446964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 1809446964 is about 42537.5947133827. The cubic root of 1809446964 is about 1218.5647737652.

The spelling of 1809446964 in words is "one billion, eight hundred nine million, four hundred forty-six thousand, nine hundred sixty-four".