394551443845 has 32 divisors (see below), whose sum is σ = 519603753312. Its totient is φ = 285807854592.

The previous prime is 394551443843. The next prime is 394551443903. The reversal of 394551443845 is 548344155493.

It can be written as a sum of positive squares in 16 ways, for example, as 146732665249 + 247818778596 = 383057^2 + 497814^2 .

It is not a de Polignac number, because 394551443845 - 2¹ = 394551443843 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 (394551443843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27321967 + ... + 27336403.

It is an arithmetic number, because the mean of its divisors is an integer number (16237617291).

Almost surely, 2^394551443845 is an apocalyptic number.

It is an amenable number.

394551443845 is a deficient number, since it is larger than the sum of its proper divisors (125052309467).

394551443845 is a wasteful number, since it uses less digits than its factorization.

394551443845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22441.

The product of its digits is 20736000, while the sum is 55.

The spelling of 394551443845 in words is "three hundred ninety-four billion, five hundred fifty-one million, four hundred forty-three thousand, eight hundred forty-five".