99806238 has 36 divisors (see below), whose sum is σ = 251554680. Its totient is φ = 28515816.

The previous prime is 99806237. The next prime is 99806299. The reversal of 99806238 is 83260899.

It is a super-2 number, since 2×99806238² = 19922570287425288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99806193 and 99806202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99806237) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 55698 + ... + 57461.

It is an arithmetic number, because the mean of its divisors is an integer number (6987630).

Almost surely, 2^99806238 is an apocalyptic number.

99806238 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

99806238 is an abundant number, since it is smaller than the sum of its proper divisors (151748442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99806238 is a wasteful number, since it uses less digits than its factorization.

99806238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113181 (or 113171 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 99806238 is about 9990.3072024838. The cubic root of 99806238 is about 463.8589016824.

The spelling of 99806238 in words is "ninety-nine million, eight hundred six thousand, two hundred thirty-eight".