400444444397 has 4 divisors (see below), whose sum is σ = 400449229596. Its totient is φ = 400439659200.

The previous prime is 400444444381. The next prime is 400444444399. The reversal of 400444444397 is 793444444004.

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 320303930116 + 80140514281 = 565954^2 + 283091^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444444397 - 2⁴ = 400444444381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400444444399) 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, 2264798 + ... + 2435199.

It is an arithmetic number, because the mean of its divisors is an integer number (100112307399).

Almost surely, 2^400444444397 is an apocalyptic number.

It is an amenable number.

400444444397 is a deficient number, since it is larger than the sum of its proper divisors (4785199).

400444444397 is an equidigital number, since it uses as much as digits as its factorization.

400444444397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785198.

The product of its (nonzero) digits is 3096576, while the sum is 47.

The spelling of 400444444397 in words is "four hundred billion, four hundred forty-four million, four hundred forty-four thousand, three hundred ninety-seven".