1998322493 has 8 divisors (see below), whose sum is σ = 2057461560. Its totient is φ = 1939678720.

The previous prime is 1998322483. The next prime is 1998322499. The reversal of 1998322493 is 3942238991.

It can be written as a sum of positive squares in 4 ways, for example, as 997422724 + 1000899769 = 31582^2 + 31637^2 .

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 1998322493 - 2¹⁰ = 1998321469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998322499) 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, 115628 + ... + 131781.

It is an arithmetic number, because the mean of its divisors is an integer number (257182695).

Almost surely, 2^1998322493 is an apocalyptic number.

It is an amenable number.

1998322493 is a deficient number, since it is larger than the sum of its proper divisors (59139067).

1998322493 is a wasteful number, since it uses less digits than its factorization.

1998322493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247647.

The product of its digits is 839808, while the sum is 50.

The square root of 1998322493 is about 44702.6005171959. The cubic root of 1998322493 is about 1259.5686969673.

The spelling of 1998322493 in words is "one billion, nine hundred ninety-eight million, three hundred twenty-two thousand, four hundred ninety-three".