99984981 has 8 divisors (see below), whose sum is σ = 134688064. Its totient is φ = 65969280.

The previous prime is 99984967. The next prime is 99984991. The reversal of 99984981 is 18948999.

It is a happy number.

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

It is not a de Polignac number, because 99984981 - 2⁷ = 99984853 is a prime.

It is a super-2 number, since 2×99984981² = 19993992851140722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99984991) 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, 171505 + ... + 172086.

It is an arithmetic number, because the mean of its divisors is an integer number (16836008).

Almost surely, 2^99984981 is an apocalyptic number.

It is an amenable number.

99984981 is a deficient number, since it is larger than the sum of its proper divisors (34703083).

99984981 is a wasteful number, since it uses less digits than its factorization.

99984981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343691.

The product of its digits is 1679616, while the sum is 57.

The square root of 99984981 is about 9999.2490218016. The cubic root of 99984981 is about 464.1356448569.

The spelling of 99984981 in words is "ninety-nine million, nine hundred eighty-four thousand, nine hundred eighty-one".