99905906 has 8 divisors (see below), whose sum is σ = 158674140. Its totient is φ = 47014528.

The previous prime is 99905903. The next prime is 99905921. The reversal of 99905906 is 60950999.

It can be written as a sum of positive squares in 2 ways, for example, as 97199881 + 2706025 = 9859^2 + 1645^2 .

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 (99905903) 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, 1469171 + ... + 1469238.

Almost surely, 2^99905906 is an apocalyptic number.

99905906 is a deficient number, since it is larger than the sum of its proper divisors (58768234).

99905906 is a wasteful number, since it uses less digits than its factorization.

99905906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938428.

The product of its (nonzero) digits is 196830, while the sum is 47.

The square root of 99905906 is about 9995.2941927689. The cubic root of 99905906 is about 464.0132557896.

The spelling of 99905906 in words is "ninety-nine million, nine hundred five thousand, nine hundred six".