99189840 has 80 divisors (see below), whose sum is σ = 311872896. Its totient is φ = 26073600.

The previous prime is 99189803. The next prime is 99189851. The reversal of 99189840 is 4898199.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 99189840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14130 + ... + 19950.

Almost surely, 2^99189840 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 99189840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155936448).

99189840 is an abundant number, since it is smaller than the sum of its proper divisors (212683056).

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

99189840 is a wasteful number, since it uses less digits than its factorization.

99189840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908 (or 5902 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 99189840 is about 9959.4096210569. The cubic root of 99189840 is about 462.9020064511.

The spelling of 99189840 in words is "ninety-nine million, one hundred eighty-nine thousand, eight hundred forty".