44399981 has 2 divisors, whose sum is σ = 44399982. Its totient is φ = 44399980.

The previous prime is 44399977. The next prime is 44400001. The reversal of 44399981 is 18999344.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 4583881 = 6310^2 + 2141^2 .

It is a cyclic number.

It is not a de Polignac number, because 44399981 - 2² = 44399977 is a prime.

It is a super-2 number, since 2×44399981² = 3942716625600722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44399911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22199990 + 22199991.

It is an arithmetic number, because the mean of its divisors is an integer number (22199991).

Almost surely, 2^44399981 is an apocalyptic number.

It is an amenable number.

44399981 is a deficient number, since it is larger than the sum of its proper divisors (1).

44399981 is an equidigital number, since it uses as much as digits as its factorization.

44399981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 44399981 is about 6663.3310738699. The cubic root of 44399981 is about 354.1013599969.

The spelling of 44399981 in words is "forty-four million, three hundred ninety-nine thousand, nine hundred eighty-one".