44135781 has 16 divisors (see below), whose sum is σ = 62329344. Its totient is φ = 27721584.

The previous prime is 44135779. The next prime is 44135807. The reversal of 44135781 is 18753144.

44135781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 44135781 - 2¹ = 44135779 is a prime.

It is a super-2 number, since 2×44135781² = 3895934328959922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44135701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151 + ... + 9396.

It is an arithmetic number, because the mean of its divisors is an integer number (3895584).

Almost surely, 2^44135781 is an apocalyptic number.

It is an amenable number.

44135781 is a deficient number, since it is larger than the sum of its proper divisors (18193563).

44135781 is a wasteful number, since it uses less digits than its factorization.

44135781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9640.

The product of its digits is 13440, while the sum is 33.

The square root of 44135781 is about 6643.4765748063. The cubic root of 44135781 is about 353.3976077645.

The spelling of 44135781 in words is "forty-four million, one hundred thirty-five thousand, seven hundred eighty-one".