400444444381 has 2 divisors, whose sum is σ = 400444444382. Its totient is φ = 400444444380.

The previous prime is 400444444369. The next prime is 400444444399. The reversal of 400444444381 is 183444444004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279555412900 + 120889031481 = 528730^2 + 347691^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444444381 - 2²⁷ = 400310226653 is a prime.

It is a super-2 number, since 2×400444444381² (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 (400444444321) 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 as a sum of consecutive naturals, namely, 200222222190 + 200222222191.

It is an arithmetic number, because the mean of its divisors is an integer number (200222222191).

Almost surely, 2^400444444381 is an apocalyptic number.

It is an amenable number.

400444444381 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444444381 is an equidigital number, since it uses as much as digits as its factorization.

400444444381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393216, while the sum is 40.

Adding to 400444444381 its reverse (183444444004), we get a palindrome (583888888385).

The spelling of 400444444381 in words is "four hundred billion, four hundred forty-four million, four hundred forty-four thousand, three hundred eighty-one".