1800989136 has 30 divisors (see below), whose sum is σ = 5040268610. Its totient is φ = 600329664.

The previous prime is 1800989123. The next prime is 1800989147. The reversal of 1800989136 is 6319890081.

It can be written as a sum of positive squares in only one way, i.e., 1242139536 + 558849600 = 35244^2 + 23640^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1800989091 and 1800989100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6253291 + ... + 6253578.

Almost surely, 2^1800989136 is an apocalyptic number.

1800989136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1800989136 is an abundant number, since it is smaller than the sum of its proper divisors (3239279474).

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

1800989136 is a wasteful number, since it uses less digits than its factorization.

1800989136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12506883 (or 12506874 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1800989136 is about 42438.0623497351. The cubic root of 1800989136 is about 1216.6631777553.

The spelling of 1800989136 in words is "one billion, eight hundred million, nine hundred eighty-nine thousand, one hundred thirty-six".