44189981 has 4 divisors (see below), whose sum is σ = 48207264. Its totient is φ = 40172700.

The previous prime is 44189927. The next prime is 44189989. The reversal of 44189981 is 18998144.

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 44189981 - 2²² = 39995677 is a prime.

It is a super-2 number, since 2×44189981² = 3905508841560722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44189989) 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, 2008625 + ... + 2008646.

It is an arithmetic number, because the mean of its divisors is an integer number (12051816).

Almost surely, 2^44189981 is an apocalyptic number.

It is an amenable number.

44189981 is a deficient number, since it is larger than the sum of its proper divisors (4017283).

44189981 is a wasteful number, since it uses less digits than its factorization.

44189981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017282.

The product of its digits is 82944, while the sum is 44.

The square root of 44189981 is about 6647.5545127513. The cubic root of 44189981 is about 353.5422093752.

The spelling of 44189981 in words is "forty-four million, one hundred eighty-nine thousand, nine hundred eighty-one".