1998337720 has 16 divisors (see below), whose sum is σ = 4496259960. Its totient is φ = 799335072.

The previous prime is 1998337687. The next prime is 1998337721. The reversal of 1998337720 is 277338991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998337721) 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 3 ways as a sum of consecutive naturals, for example, 24979182 + ... + 24979261.

Almost surely, 2^1998337720 is an apocalyptic number.

1998337720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998337720 is an abundant number, since it is smaller than the sum of its proper divisors (2497922240).

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

1998337720 is a wasteful number, since it uses less digits than its factorization.

1998337720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49958454 (or 49958450 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 1998337720 is about 44702.7708313478. The cubic root of 1998337720 is about 1259.5718962180.

The spelling of 1998337720 in words is "one billion, nine hundred ninety-eight million, three hundred thirty-seven thousand, seven hundred twenty".