99139820 has 48 divisors (see below), whose sum is σ = 226577568. Its totient is φ = 36218880.

The previous prime is 99139813. The next prime is 99139837. The reversal of 99139820 is 2893199.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23255 + ... + 27185.

It is an arithmetic number, because the mean of its divisors is an integer number (4720366).

Almost surely, 2^99139820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99139820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113288784).

99139820 is an abundant number, since it is smaller than the sum of its proper divisors (127437748).

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

99139820 is a wasteful number, since it uses less digits than its factorization.

99139820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050 (or 4048 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 99139820 is about 9956.8981113598. The cubic root of 99139820 is about 462.8241817747.

The spelling of 99139820 in words is "ninety-nine million, one hundred thirty-nine thousand, eight hundred twenty".