1998392271 has 8 divisors (see below), whose sum is σ = 2670706944. Its totient is φ = 1329169560.

The previous prime is 1998392261. The next prime is 1998392273. The reversal of 1998392271 is 1722938991.

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

It is not a de Polignac number, because 1998392271 - 2¹¹ = 1998390223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998392273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771481 + ... + 774066.

It is an arithmetic number, because the mean of its divisors is an integer number (333838368).

Almost surely, 2^1998392271 is an apocalyptic number.

1998392271 is a deficient number, since it is larger than the sum of its proper divisors (672314673).

1998392271 is a wasteful number, since it uses less digits than its factorization.

1998392271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545981.

The product of its digits is 489888, while the sum is 51.

The square root of 1998392271 is about 44703.3809795188. The cubic root of 1998392271 is about 1259.5833574574.

The spelling of 1998392271 in words is "one billion, nine hundred ninety-eight million, three hundred ninety-two thousand, two hundred seventy-one".