400444043957 has 2 divisors, whose sum is σ = 400444043958. Its totient is φ = 400444043956.

The previous prime is 400444043939. The next prime is 400444044073. The reversal of 400444043957 is 759340444004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298508156881 + 101935887076 = 546359^2 + 319274^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444043957 - 2¹² = 400444039861 is a prime.

It is a super-3 number, since 3×400444043957³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400444043917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200222021978 + 200222021979.

It is an arithmetic number, because the mean of its divisors is an integer number (200222021979).

Almost surely, 2^400444043957 is an apocalyptic number.

It is an amenable number.

400444043957 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444043957 is an equidigital number, since it uses as much as digits as its factorization.

400444043957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 44.

The spelling of 400444043957 in words is "four hundred billion, four hundred forty-four million, forty-three thousand, nine hundred fifty-seven".