40444400399981 has 4 divisors (see below), whose sum is σ = 40649701925052. Its totient is φ = 40239098874912.

The previous prime is 40444400399947. The next prime is 40444400399983. The reversal of 40444400399981 is 18999300444404.

It is a happy number.

40444400399981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38604674386756 + 1839726013225 = 6213266^2 + 1356365^2 .

It is a cyclic number.

It is not a de Polignac number, because 40444400399981 - 2⁴² = 36046353888877 is a prime.

It is a super-2 number, since 2×40444400399981² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40444400399981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40444400399983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102650762240 + ... + 102650762633.

It is an arithmetic number, because the mean of its divisors is an integer number (10162425481263).

Almost surely, 2^{40444400399981} is an apocalyptic number.

It is an amenable number.

40444400399981 is a deficient number, since it is larger than the sum of its proper divisors (205301525071).

40444400399981 is a wasteful number, since it uses less digits than its factorization.

40444400399981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205301525070.

The product of its (nonzero) digits is 17915904, while the sum is 59.

The spelling of 40444400399981 in words is "forty trillion, four hundred forty-four billion, four hundred million, three hundred ninety-nine thousand, nine hundred eighty-one".