99943638 has 8 divisors (see below), whose sum is σ = 199887288. Its totient is φ = 33314544.

The previous prime is 99943621. The next prime is 99943639. The reversal of 99943638 is 83634999.

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

99943638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99943639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8328631 + ... + 8328642.

It is an arithmetic number, because the mean of its divisors is an integer number (24985911).

Almost surely, 2^99943638 is an apocalyptic number.

99943638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

99943638 is a wasteful number, since it uses less digits than its factorization.

99943638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16657278.

The product of its digits is 1259712, while the sum is 51.

The square root of 99943638 is about 9997.1815028037. The cubic root of 99943638 is about 464.0716638964.

The spelling of 99943638 in words is "ninety-nine million, nine hundred forty-three thousand, six hundred thirty-eight".