99989905 has 16 divisors (see below), whose sum is σ = 122330880. Its totient is φ = 78444288.

The previous prime is 99989891. The next prime is 99989909. The reversal of 99989905 is 50998999.

It is a cyclic number.

It is not a de Polignac number, because 99989905 - 2²³ = 91601297 is a prime.

It is a super-2 number, since 2×99989905² = 19995962203818050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99989905.

It is not an unprimeable number, because it can be changed into a prime (99989909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63609 + ... + 65161.

It is an arithmetic number, because the mean of its divisors is an integer number (7645680).

Almost surely, 2^99989905 is an apocalyptic number.

It is an amenable number.

99989905 is a deficient number, since it is larger than the sum of its proper divisors (22340975).

99989905 is a wasteful number, since it uses less digits than its factorization.

99989905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800.

The product of its (nonzero) digits is 2361960, while the sum is 58.

The square root of 99989905 is about 9999.4952372607. The cubic root of 99989905 is about 464.1432638892.

The spelling of 99989905 in words is "ninety-nine million, nine hundred eighty-nine thousand, nine hundred five".