44443981 has 16 divisors (see below), whose sum is σ = 47628288. Its totient is φ = 41382000.

The previous prime is 44443961. The next prime is 44443991. The reversal of 44443981 is 18934444.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 44443981 - 2⁷ = 44443853 is a prime.

It is a super-2 number, since 2×44443981² = 3950534894256722, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (55296) is a multiple of the sum of its prime divisors (432).

It is a self number, because there is not a number n which added to its sum of digits gives 44443981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44443951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232596 + ... + 232786.

It is an arithmetic number, because the mean of its divisors is an integer number (2976768).

Almost surely, 2^44443981 is an apocalyptic number.

It is an amenable number.

44443981 is a deficient number, since it is larger than the sum of its proper divisors (3184307).

44443981 is a wasteful number, since it uses less digits than its factorization.

44443981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its digits is 55296, while the sum is 37.

The square root of 44443981 is about 6666.6319082427. The cubic root of 44443981 is about 354.2182918486.

The spelling of 44443981 in words is "forty-four million, four hundred forty-three thousand, nine hundred eighty-one".