99840442 has 8 divisors (see below), whose sum is σ = 161280756. Its totient is φ = 46080192.

The previous prime is 99840409. The next prime is 99840443. The reversal of 99840442 is 24404899.

It can be written as a sum of positive squares in 2 ways, for example, as 82791801 + 17048641 = 9099^2 + 4129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×99840442³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 99840395 and 99840404.

It is not an unprimeable number, because it can be changed into a prime (99840443) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1919983 + ... + 1920034.

Almost surely, 2^99840442 is an apocalyptic number.

99840442 is a deficient number, since it is larger than the sum of its proper divisors (61440314).

99840442 is a wasteful number, since it uses less digits than its factorization.

99840442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840032.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 99840442 is about 9992.0189151142. The cubic root of 99840442 is about 463.9118844021.

The spelling of 99840442 in words is "ninety-nine million, eight hundred forty thousand, four hundred forty-two".