1998697047 has 8 divisors (see below), whose sum is σ = 2672192256. Its totient is φ = 1328833272.

The previous prime is 1998697037. The next prime is 1998697049. The reversal of 1998697047 is 7407968991.

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

It is not a de Polignac number, because 1998697047 - 2⁴ = 1998697031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998697049) 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 7 ways as a sum of consecutive naturals, for example, 906573 + ... + 908774.

It is an arithmetic number, because the mean of its divisors is an integer number (334024032).

Almost surely, 2^1998697047 is an apocalyptic number.

1998697047 is a deficient number, since it is larger than the sum of its proper divisors (673495209).

1998697047 is a wasteful number, since it uses less digits than its factorization.

1998697047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815717.

The product of its (nonzero) digits is 6858432, while the sum is 60.

The square root of 1998697047 is about 44706.7897192362. The cubic root of 1998697047 is about 1259.6473874728.

The spelling of 1998697047 in words is "one billion, nine hundred ninety-eight million, six hundred ninety-seven thousand, forty-seven".