44009991 has 24 divisors (see below), whose sum is σ = 67597920. Its totient is φ = 27495936.

The previous prime is 44009963. The next prime is 44010073. The reversal of 44009991 is 19990044.

44009991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 44009991 - 2¹⁵ = 43977223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44009951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47430 + ... + 48348.

It is an arithmetic number, because the mean of its divisors is an integer number (2816580).

Almost surely, 2^44009991 is an apocalyptic number.

44009991 is a deficient number, since it is larger than the sum of its proper divisors (23587929).

44009991 is a wasteful number, since it uses less digits than its factorization.

44009991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 44009991 is about 6634.0026379253. The cubic root of 44009991 is about 353.0615525030.

The spelling of 44009991 in words is "forty-four million, nine thousand, nine hundred ninety-one".