44172909 has 12 divisors (see below), whose sum is σ = 69605952. Its totient is φ = 26771400.

The previous prime is 44172893. The next prime is 44172937. The reversal of 44172909 is 90927144.

It is not a de Polignac number, because 44172909 - 2⁴ = 44172893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44172959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222997 + ... + 223194.

It is an arithmetic number, because the mean of its divisors is an integer number (5800496).

Almost surely, 2^44172909 is an apocalyptic number.

It is an amenable number.

44172909 is a deficient number, since it is larger than the sum of its proper divisors (25433043).

44172909 is a wasteful number, since it uses less digits than its factorization.

44172909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446208 (or 446205 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 44172909 is about 6646.2703074732. The cubic root of 44172909 is about 353.4966752980.

The spelling of 44172909 in words is "forty-four million, one hundred seventy-two thousand, nine hundred nine".