1998004550 has 12 divisors (see below), whose sum is σ = 3716288556. Its totient is φ = 799201800.

The previous prime is 1998004537. The next prime is 1998004597. The reversal of 1998004550 is 554008991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1998004498 and 1998004507.

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, 19979996 + ... + 19980095.

It is an arithmetic number, because the mean of its divisors is an integer number (309690713).

Almost surely, 2^1998004550 is an apocalyptic number.

1998004550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998004550 is a deficient number, since it is larger than the sum of its proper divisors (1718284006).

1998004550 is a wasteful number, since it uses less digits than its factorization.

1998004550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39960103 (or 39960098 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 1998004550 is about 44699.0441732259. The cubic root of 1998004550 is about 1259.5018922194.

The spelling of 1998004550 in words is "one billion, nine hundred ninety-eight million, four thousand, five hundred fifty".