1998620885 has 8 divisors (see below), whose sum is σ = 2399020416. Its totient is φ = 1598446480.

The previous prime is 1998620881. The next prime is 1998620893. The reversal of 1998620885 is 5880268991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998620885 - 2² = 1998620881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1998620885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998620881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36089 + ... + 72798.

It is an arithmetic number, because the mean of its divisors is an integer number (299877552).

Almost surely, 2^1998620885 is an apocalyptic number.

It is an amenable number.

1998620885 is a deficient number, since it is larger than the sum of its proper divisors (400399531).

1998620885 is a wasteful number, since it uses less digits than its factorization.

1998620885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112563.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The square root of 1998620885 is about 44705.9379165676. The cubic root of 1998620885 is about 1259.6313873019.

The spelling of 1998620885 in words is "one billion, nine hundred ninety-eight million, six hundred twenty thousand, eight hundred eighty-five".