99981438 has 16 divisors (see below), whose sum is σ = 200134800. Its totient is φ = 33298496.

The previous prime is 99981421. The next prime is 99981451. The reversal of 99981438 is 83418999.

It is a happy number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 1138 + ... + 14186.

It is an arithmetic number, because the mean of its divisors is an integer number (12508425).

Almost surely, 2^99981438 is an apocalyptic number.

99981438 is an abundant number, since it is smaller than the sum of its proper divisors (100153362).

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

99981438 is a wasteful number, since it uses less digits than its factorization.

99981438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14331.

The product of its digits is 559872, while the sum is 51.

The square root of 99981438 is about 9999.0718569275. The cubic root of 99981438 is about 464.1301625268.

The spelling of 99981438 in words is "ninety-nine million, nine hundred eighty-one thousand, four hundred thirty-eight".