981999998 has 8 divisors (see below), whose sum is σ = 1683428592. Its totient is φ = 420857136.

The previous prime is 981999983. The next prime is 982000007. The reversal of 981999998 is 899999189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35071415 + ... + 35071442.

It is an arithmetic number, because the mean of its divisors is an integer number (210428574).

Almost surely, 2^981999998 is an apocalyptic number.

981999998 is a deficient number, since it is larger than the sum of its proper divisors (701428594).

981999998 is a wasteful number, since it uses less digits than its factorization.

981999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70142866.

The product of its digits is 34012224, while the sum is 71.

The square root of 981999998 is about 31336.8792000735. The cubic root of 981999998 is about 993.9636349474.

The spelling of 981999998 in words is "nine hundred eighty-one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".