99421686 has 216 divisors, whose sum is σ = 292902480. Its totient is φ = 24216192.

The previous prime is 99421607. The next prime is 99421691. The reversal of 99421686 is 68612499.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3428320 + ... + 3428348.

It is an arithmetic number, because the mean of its divisors is an integer number (1356030).

Almost surely, 2^99421686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99421686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146451240).

99421686 is an abundant number, since it is smaller than the sum of its proper divisors (193480794).

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

99421686 is a wasteful number, since it uses less digits than its factorization.

99421686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 77 counting only the distinct ones).

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

The square root of 99421686 is about 9971.0423727913. The cubic root of 99421686 is about 463.2623876789.

It can be divided in two parts, 9942 and 1686, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 99421686 in words is "ninety-nine million, four hundred twenty-one thousand, six hundred eighty-six".