99938447 has 4 divisors (see below), whose sum is σ = 114215376. Its totient is φ = 85661520.

The previous prime is 99938441. The next prime is 99938477. The reversal of 99938447 is 74483999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74483999 = 251 ⋅296749.

It is not a de Polignac number, because 99938447 - 2⁴ = 99938431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99938441) 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, 7138454 + ... + 7138467.

It is an arithmetic number, because the mean of its divisors is an integer number (28553844).

Almost surely, 2^99938447 is an apocalyptic number.

99938447 is a deficient number, since it is larger than the sum of its proper divisors (14276929).

99938447 is a wasteful number, since it uses less digits than its factorization.

99938447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14276928.

The product of its digits is 1959552, while the sum is 53.

The square root of 99938447 is about 9996.9218762577. The cubic root of 99938447 is about 464.0636292422.

The spelling of 99938447 in words is "ninety-nine million, nine hundred thirty-eight thousand, four hundred forty-seven".