99539820 has 48 divisors (see below), whose sum is σ = 309681120. Its totient is φ = 26543808.

The previous prime is 99539819. The next prime is 99539821. The reversal of 99539820 is 2893599.

99539820 is a `hidden beast` number, since 99 + 539 + 8 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (99539819) and next prime (99539821).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (99539821) 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, 91627 + ... + 92706.

It is an arithmetic number, because the mean of its divisors is an integer number (6451690).

Almost surely, 2^99539820 is an apocalyptic number.

99539820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99539820 is an abundant number, since it is smaller than the sum of its proper divisors (210141300).

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

99539820 is a wasteful number, since it uses less digits than its factorization.

99539820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184351 (or 184343 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 99539820 is about 9976.9644682138. The cubic root of 99539820 is about 463.4457996341.

The spelling of 99539820 in words is "ninety-nine million, five hundred thirty-nine thousand, eight hundred twenty".