1998635982 has 16 divisors (see below), whose sum is σ = 4568310912. Its totient is φ = 571038840.

The previous prime is 1998635981. The next prime is 1998635983. The reversal of 1998635982 is 2895368991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1998635981) and next prime (1998635983).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998635981) 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, 23793244 + ... + 23793327.

It is an arithmetic number, because the mean of its divisors is an integer number (285519432).

Almost surely, 2^1998635982 is an apocalyptic number.

1998635982 is an abundant number, since it is smaller than the sum of its proper divisors (2569674930).

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

1998635982 is a wasteful number, since it uses less digits than its factorization.

1998635982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47586583.

The product of its digits is 8398080, while the sum is 60.

The square root of 1998635982 is about 44706.1067640652. The cubic root of 1998635982 is about 1259.6345589234.

The spelling of 1998635982 in words is "one billion, nine hundred ninety-eight million, six hundred thirty-five thousand, nine hundred eighty-two".