99989906 has 8 divisors (see below), whose sum is σ = 152814924. Its totient is φ = 49051600.

The previous prime is 99989891. The next prime is 99989909. The reversal of 99989906 is 60998999.

It can be written as a sum of positive squares in 2 ways, for example, as 80550625 + 19439281 = 8975^2 + 4409^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 471545 + ... + 471756.

Almost surely, 2^99989906 is an apocalyptic number.

99989906 is a deficient number, since it is larger than the sum of its proper divisors (52825018).

99989906 is a wasteful number, since it uses less digits than its factorization.

99989906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943356.

The product of its (nonzero) digits is 2834352, while the sum is 59.

The square root of 99989906 is about 9999.4952872633. The cubic root of 99989906 is about 464.1432654365.

The spelling of 99989906 in words is "ninety-nine million, nine hundred eighty-nine thousand, nine hundred six".