44172721 has 4 divisors (see below), whose sum is σ = 44794944. Its totient is φ = 43550500.

The previous prime is 44172677. The next prime is 44172727. The reversal of 44172721 is 12727144.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 44172721 - 2¹¹ = 44170673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 44172721.

It is not an unprimeable number, because it can be changed into a prime (44172727) 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, 311005 + ... + 311146.

It is an arithmetic number, because the mean of its divisors is an integer number (11198736).

Almost surely, 2^44172721 is an apocalyptic number.

It is an amenable number.

44172721 is a deficient number, since it is larger than the sum of its proper divisors (622223).

44172721 is an equidigital number, since it uses as much as digits as its factorization.

44172721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622222.

The product of its digits is 3136, while the sum is 28.

The square root of 44172721 is about 6646.2561641875. The cubic root of 44172721 is about 353.4961738031.

Adding to 44172721 its reverse (12727144), we get a palindrome (56899865).

The spelling of 44172721 in words is "forty-four million, one hundred seventy-two thousand, seven hundred twenty-one".