99981705 has 32 divisors (see below), whose sum is σ = 174211200. Its totient is φ = 48771072.

The previous prime is 99981701. The next prime is 99981757. The reversal of 99981705 is 50718999.

It is not a de Polignac number, because 99981705 - 2² = 99981701 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (99981701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2217 + ... + 14313.

It is an arithmetic number, because the mean of its divisors is an integer number (5444100).

Almost surely, 2^99981705 is an apocalyptic number.

99981705 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99981705 is a deficient number, since it is larger than the sum of its proper divisors (74229495).

99981705 is a wasteful number, since it uses less digits than its factorization.

99981705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12153.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 99981705 is about 9999.0852081578. The cubic root of 99981705 is about 464.1305756790.

The spelling of 99981705 in words is "ninety-nine million, nine hundred eighty-one thousand, seven hundred five".