1998320699 has 8 divisors (see below), whose sum is σ = 2023733712. Its totient is φ = 1972939680.

The previous prime is 1998320693. The next prime is 1998320711. The reversal of 1998320699 is 9960238991.

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 1998320699 - 2⁴ = 1998320683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998320693) 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, 133409 + ... + 147629.

It is an arithmetic number, because the mean of its divisors is an integer number (252966714).

Almost surely, 2^1998320699 is an apocalyptic number.

1998320699 is a deficient number, since it is larger than the sum of its proper divisors (25413013).

1998320699 is a wasteful number, since it uses less digits than its factorization.

1998320699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15997.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The square root of 1998320699 is about 44702.5804512446. The cubic root of 1998320699 is about 1259.5683200400.

The spelling of 1998320699 in words is "one billion, nine hundred ninety-eight million, three hundred twenty thousand, six hundred ninety-nine".