1998107136 has 80 divisors (see below), whose sum is σ = 5914576800. Its totient is φ = 666031104.

The previous prime is 1998107131. The next prime is 1998107143. The reversal of 1998107136 is 6317018991.

It is a junction number, because it is equal to n+sod(n) for n = 1998107091 and 1998107100.

It is not an unprimeable number, because it can be changed into a prime (1998107131) 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, 58446 + ... + 86093.

It is an arithmetic number, because the mean of its divisors is an integer number (73932210).

Almost surely, 2^1998107136 is an apocalyptic number.

1998107136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1998107136 is an abundant number, since it is smaller than the sum of its proper divisors (3916469664).

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

1998107136 is an equidigital number, since it uses as much as digits as its factorization.

1998107136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144566 (or 144544 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 1998107136 is about 44700.1916774414. The cubic root of 1998107136 is about 1259.5234479010.

The spelling of 1998107136 in words is "one billion, nine hundred ninety-eight million, one hundred seven thousand, one hundred thirty-six".