44135721 has 36 divisors (see below), whose sum is σ = 75999924. Its totient is φ = 24595200.

The previous prime is 44135719. The next prime is 44135731. The reversal of 44135721 is 12753144.

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 41024025 = 1764^2 + 6405^2 .

It is not a de Polignac number, because 44135721 - 2¹ = 44135719 is a prime.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16861 + ... + 19301.

It is an arithmetic number, because the mean of its divisors is an integer number (2111109).

Almost surely, 2^44135721 is an apocalyptic number.

44135721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

44135721 is a deficient number, since it is larger than the sum of its proper divisors (31864203).

44135721 is a wasteful number, since it uses less digits than its factorization.

44135721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502 (or 2492 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 44135721 is about 6643.4720590968. The cubic root of 44135721 is about 353.3974476233.

Adding to 44135721 its reverse (12753144), we get a palindrome (56888865).

It can be divided in two parts, 441 and 35721, that multiplied together give a 4-th power (15752961 = 63⁴).

The spelling of 44135721 in words is "forty-four million, one hundred thirty-five thousand, seven hundred twenty-one".