44085721 has 4 divisors (see below), whose sum is σ = 44102052. Its totient is φ = 44069392.

The previous prime is 44085683. The next prime is 44085739. The reversal of 44085721 is 12758044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34351321 + 9734400 = 5861^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 44085721 - 2²³ = 35697113 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44085761) 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, 3046 + ... + 9871.

It is an arithmetic number, because the mean of its divisors is an integer number (11025513).

Almost surely, 2^44085721 is an apocalyptic number.

It is an amenable number.

44085721 is a deficient number, since it is larger than the sum of its proper divisors (16331).

44085721 is a wasteful number, since it uses less digits than its factorization.

44085721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16330.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 44085721 is about 6639.7079002016. The cubic root of 44085721 is about 353.2639461667.

The spelling of 44085721 in words is "forty-four million, eighty-five thousand, seven hundred twenty-one".