1998023715 has 12 divisors (see below), whose sum is σ = 3463241184. Its totient is φ = 1065612624.

The previous prime is 1998023693. The next prime is 1998023723. The reversal of 1998023715 is 5173208991.

It is not a de Polignac number, because 1998023715 - 2⁸ = 1998023459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 44400527 = 1998023715 / (1 + 9 + 9 + 8 + 0 + 2 + 3 + 7 + 1 + 5).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 22200219 + ... + 22200308.

It is an arithmetic number, because the mean of its divisors is an integer number (288603432).

Almost surely, 2^1998023715 is an apocalyptic number.

1998023715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998023715 is a deficient number, since it is larger than the sum of its proper divisors (1465217469).

1998023715 is a wasteful number, since it uses less digits than its factorization.

1998023715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44400538 (or 44400535 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1998023715 is about 44699.2585508977. The cubic root of 1998023715 is about 1259.5059192834.

The spelling of 1998023715 in words is "one billion, nine hundred ninety-eight million, twenty-three thousand, seven hundred fifteen".