44388891 has 20 divisors (see below), whose sum is σ = 67226632. Its totient is φ = 29183328.

The previous prime is 44388889. The next prime is 44388899. The reversal of 44388891 is 19888344.

It is not a de Polignac number, because 44388891 - 2¹ = 44388889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44388899) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2160 + ... + 9666.

Almost surely, 2^44388891 is an apocalyptic number.

44388891 is a deficient number, since it is larger than the sum of its proper divisors (22837741).

44388891 is an equidigital number, since it uses as much as digits as its factorization.

44388891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592 (or 7583 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 44388891 is about 6662.4988555346. The cubic root of 44388891 is about 354.0718756669.

The spelling of 44388891 in words is "forty-four million, three hundred eighty-eight thousand, eight hundred ninety-one".