1998623104 has 16 divisors (see below), whose sum is σ = 3981632220. Its totient is φ = 999311488.

The previous prime is 1998623059. The next prime is 1998623153. The reversal of 1998623104 is 4013268991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7806994 + ... + 7807249.

Almost surely, 2^1998623104 is an apocalyptic number.

It is an amenable number.

1998623104 is a deficient number, since it is larger than the sum of its proper divisors (1983009116).

1998623104 is an equidigital number, since it uses as much as digits as its factorization.

1998623104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15614257 (or 15614245 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1998623104 is about 44705.9627342931. The cubic root of 1998623104 is about 1259.6318534768.

The spelling of 1998623104 in words is "one billion, nine hundred ninety-eight million, six hundred twenty-three thousand, one hundred four".