99944399 has 4 divisors (see below), whose sum is σ = 100496760. Its totient is φ = 99392040.

The previous prime is 99944393. The next prime is 99944431. The reversal of 99944399 is 99344999.

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: 99344999 = 13 ⋅7641923.

It is a cyclic number.

It is not a de Polignac number, because 99944399 - 2¹² = 99940303 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 (99944393) 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, 275909 + ... + 276270.

It is an arithmetic number, because the mean of its divisors is an integer number (25124190).

Almost surely, 2^99944399 is an apocalyptic number.

99944399 is a deficient number, since it is larger than the sum of its proper divisors (552361).

99944399 is a wasteful number, since it uses less digits than its factorization.

99944399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552360.

The product of its digits is 2834352, while the sum is 56.

The square root of 99944399 is about 9997.2195634586. The cubic root of 99944399 is about 464.0728417524.

The spelling of 99944399 in words is "ninety-nine million, nine hundred forty-four thousand, three hundred ninety-nine".