99856906 has 4 divisors (see below), whose sum is σ = 149785362. Its totient is φ = 49928452.

The previous prime is 99856891. The next prime is 99856907. The reversal of 99856906 is 60965899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60965899 = 37 ⋅1647727.

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 34327881 = 8095^2 + 5859^2 .

It is not an unprimeable number, because it can be changed into a prime (99856907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24964225 + ... + 24964228.

Almost surely, 2^99856906 is an apocalyptic number.

99856906 is a deficient number, since it is larger than the sum of its proper divisors (49928456).

99856906 is a wasteful number, since it uses less digits than its factorization.

99856906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49928455.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 99856906 is about 9992.8427386805. The cubic root of 99856906 is about 463.9373831723.

The spelling of 99856906 in words is "ninety-nine million, eight hundred fifty-six thousand, nine hundred six".