1998729216 has 416 divisors, whose sum is σ = 6793943040. Its totient is φ = 575078400.

The previous prime is 1998729199. The next prime is 1998729217. The reversal of 1998729216 is 6129278991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1998729217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37711846 + ... + 37711898.

Almost surely, 2^1998729216 is an apocalyptic number.

1998729216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998729216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3396971520).

1998729216 is an abundant number, since it is smaller than the sum of its proper divisors (4795213824).

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

1998729216 is a wasteful number, since it uses less digits than its factorization.

1998729216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 100 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 1998729216 is about 44707.1494953548. The cubic root of 1998729216 is about 1259.6541454387.

The spelling of 1998729216 in words is "one billion, nine hundred ninety-eight million, seven hundred twenty-nine thousand, two hundred sixteen".