1998728747 has 8 divisors (see below), whose sum is σ = 2021868576. Its totient is φ = 1975640832.

The previous prime is 1998728723. The next prime is 1998728801. The reversal of 1998728747 is 7478278991.

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

It is a cyclic number.

It is not a de Polignac number, because 1998728747 - 2¹⁴ = 1998712363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1998728747.

It is not an unprimeable number, because it can be changed into a prime (1998727747) 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, 67313 + ... + 92349.

It is an arithmetic number, because the mean of its divisors is an integer number (252733572).

Almost surely, 2^1998728747 is an apocalyptic number.

1998728747 is a deficient number, since it is larger than the sum of its proper divisors (23139829).

1998728747 is an equidigital number, since it uses as much as digits as its factorization.

1998728747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25957.

The product of its digits is 14224896, while the sum is 62.

The square root of 1998728747 is about 44707.1442501084. The cubic root of 1998728747 is about 1259.6540469131.

The spelling of 1998728747 in words is "one billion, nine hundred ninety-eight million, seven hundred twenty-eight thousand, seven hundred forty-seven".