404444039981 has 2 divisors, whose sum is σ = 404444039982. Its totient is φ = 404444039980.

The previous prime is 404444039969. The next prime is 404444040041. The reversal of 404444039981 is 189930444404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404357363881 + 86676100 = 635891^2 + 9310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404444039981 is a prime.

It is a super-2 number, since 2×404444039981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404444039381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202222019990 + 202222019991.

It is an arithmetic number, because the mean of its divisors is an integer number (202222019991).

Almost surely, 2^404444039981 is an apocalyptic number.

It is an amenable number.

404444039981 is a deficient number, since it is larger than the sum of its proper divisors (1).

404444039981 is an equidigital number, since it uses as much as digits as its factorization.

404444039981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 404444039981 in words is "four hundred four billion, four hundred forty-four million, thirty-nine thousand, nine hundred eighty-one".