44189881 has 4 divisors (see below), whose sum is σ = 45713700. Its totient is φ = 42666064.

The previous prime is 44189869. The next prime is 44189891. The reversal of 44189881 is 18898144.

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 21949225 + 22240656 = 4685^2 + 4716^2 .

It is a cyclic number.

It is not a de Polignac number, because 44189881 - 2⁷ = 44189753 is a prime.

It is a super-2 number, since 2×44189881² = 3905491165588322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44189891) 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 3 ways as a sum of consecutive naturals, for example, 761866 + ... + 761923.

It is an arithmetic number, because the mean of its divisors is an integer number (11428425).

Almost surely, 2^44189881 is an apocalyptic number.

It is an amenable number.

44189881 is a deficient number, since it is larger than the sum of its proper divisors (1523819).

44189881 is a wasteful number, since it uses less digits than its factorization.

44189881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523818.

The product of its digits is 73728, while the sum is 43.

The square root of 44189881 is about 6647.5469911840. The cubic root of 44189881 is about 353.5419426915.

The spelling of 44189881 in words is "forty-four million, one hundred eighty-nine thousand, eight hundred eighty-one".