1998417636 has 24 divisors (see below), whose sum is σ = 5181083040. Its totient is φ = 666139176.

The previous prime is 1998417623. The next prime is 1998417661. The reversal of 1998417636 is 6367148991.

1998417636 is a `hidden beast` number, since 199 + 8 + 417 + 6 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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, 9251826 + ... + 9252041.

It is an arithmetic number, because the mean of its divisors is an integer number (215878460).

Almost surely, 2^1998417636 is an apocalyptic number.

It is an amenable number.

1998417636 is an abundant number, since it is smaller than the sum of its proper divisors (3182665404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998417636 is a wasteful number, since it uses less digits than its factorization.

1998417636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18503880 (or 18503872 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1998417636 is about 44703.6646819922. The cubic root of 1998417636 is about 1259.5886866075.

The spelling of 1998417636 in words is "one billion, nine hundred ninety-eight million, four hundred seventeen thousand, six hundred thirty-six".