1998411018 has 16 divisors (see below), whose sum is σ = 4047415680. Its totient is φ = 657704736.

The previous prime is 1998410977. The next prime is 1998411059. The reversal of 1998411018 is 8101148991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1998410977) and next prime (1998411059).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2107555 + ... + 2108502.

It is an arithmetic number, because the mean of its divisors is an integer number (252963480).

Almost surely, 2^1998411018 is an apocalyptic number.

1998411018 is an abundant number, since it is smaller than the sum of its proper divisors (2049004662).

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

1998411018 is a wasteful number, since it uses less digits than its factorization.

1998411018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216141.

The product of its (nonzero) digits is 20736, while the sum is 42.

The square root of 1998411018 is about 44703.5906611538. The cubic root of 1998411018 is about 1259.5872961795.

The spelling of 1998411018 in words is "one billion, nine hundred ninety-eight million, four hundred eleven thousand, eighteen".