1998923011 has 8 divisors (see below), whose sum is σ = 2027235920. Its totient is φ = 1970635392.

The previous prime is 1998922993. The next prime is 1998923021. The reversal of 1998923011 is 1103298991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998923011 is a prime.

It is a super-2 number, since 2×1998923011² = 7991386407810612242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998923021) 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, 199735 + ... + 209503.

It is an arithmetic number, because the mean of its divisors is an integer number (253404490).

Almost surely, 2^1998923011 is an apocalyptic number.

1998923011 is a deficient number, since it is larger than the sum of its proper divisors (28312909).

1998923011 is an equidigital number, since it uses as much as digits as its factorization.

1998923011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12645.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 1998923011 is about 44709.3168254672. The cubic root of 1998923011 is about 1259.6948557700.

The spelling of 1998923011 in words is "one billion, nine hundred ninety-eight million, nine hundred twenty-three thousand, eleven".