44138749 has 8 divisors (see below), whose sum is σ = 47261880. Its totient is φ = 41074176.

The previous prime is 44138741. The next prime is 44138777. The reversal of 44138749 is 94783144.

It can be written as a sum of positive squares in 4 ways, for example, as 710649 + 43428100 = 843^2 + 6590^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 44138749 - 2³ = 44138741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44138741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13074 + ... + 16099.

It is an arithmetic number, because the mean of its divisors is an integer number (5907735).

Almost surely, 2^44138749 is an apocalyptic number.

It is an amenable number.

44138749 is a deficient number, since it is larger than the sum of its proper divisors (3123131).

44138749 is a wasteful number, since it uses less digits than its factorization.

44138749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29279.

The product of its digits is 96768, while the sum is 40.

The square root of 44138749 is about 6643.6999480711. The cubic root of 44138749 is about 353.4055292330.

The spelling of 44138749 in words is "forty-four million, one hundred thirty-eight thousand, seven hundred forty-nine".