99893981 has 8 divisors (see below), whose sum is σ = 109149984. Its totient is φ = 90667120.

The previous prime is 99893971. The next prime is 99893987. The reversal of 99893981 is 18939899.

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

It is a cyclic number.

It is not a de Polignac number, because 99893981 - 2¹⁰ = 99892957 is a prime.

It is a super-2 number, since 2×99893981² = 19957614880056722, 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 (99893987) 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, 230 + ... + 14136.

It is an arithmetic number, because the mean of its divisors is an integer number (13643748).

Almost surely, 2^99893981 is an apocalyptic number.

It is an amenable number.

99893981 is a deficient number, since it is larger than the sum of its proper divisors (9256003).

99893981 is a wasteful number, since it uses less digits than its factorization.

99893981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14571.

The product of its digits is 1259712, while the sum is 56.

The square root of 99893981 is about 9994.6976442512. The cubic root of 99893981 is about 463.9947931565.

The spelling of 99893981 in words is "ninety-nine million, eight hundred ninety-three thousand, nine hundred eighty-one".