44138989 has 2 divisors, whose sum is σ = 44138990. Its totient is φ = 44138988.

The previous prime is 44138923. The next prime is 44138993. The reversal of 44138989 is 98983144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25502500 + 18636489 = 5050^2 + 4317^2 .

It is a cyclic number.

It is not a de Polignac number, because 44138989 - 2¹¹ = 44136941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44138999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22069494 + 22069495.

It is an arithmetic number, because the mean of its divisors is an integer number (22069495).

Almost surely, 2^44138989 is an apocalyptic number.

It is an amenable number.

44138989 is a deficient number, since it is larger than the sum of its proper divisors (1).

44138989 is an equidigital number, since it uses as much as digits as its factorization.

44138989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 44138989 is about 6643.7180102711. The cubic root of 44138989 is about 353.4061697674.

The spelling of 44138989 in words is "forty-four million, one hundred thirty-eight thousand, nine hundred eighty-nine".