1809989146 has 12 divisors (see below), whose sum is σ = 3158246538. Its totient is φ = 775709592.

The previous prime is 1809989123. The next prime is 1809989147. The reversal of 1809989146 is 6419899081.

It can be written as a sum of positive squares in only one way, i.e., 1566972225 + 243016921 = 39585^2 + 15589^2 .

It is not an unprimeable number, because it can be changed into a prime (1809989147) 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 5 ways as a sum of consecutive naturals, for example, 9234541 + ... + 9234736.

Almost surely, 2^1809989146 is an apocalyptic number.

1809989146 is a deficient number, since it is larger than the sum of its proper divisors (1348257392).

1809989146 is a wasteful number, since it uses less digits than its factorization.

1809989146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18469293 (or 18469286 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 1809989146 is about 42543.9672104048. The cubic root of 1809989146 is about 1218.6864717059.

The spelling of 1809989146 in words is "one billion, eight hundred nine million, nine hundred eighty-nine thousand, one hundred forty-six".