400440480444 has 18 divisors (see below), whose sum is σ = 1012224547880. Its totient is φ = 133480160136.

The previous prime is 400440480431. The next prime is 400440480529. The reversal of 400440480444 is 444084044004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 11123346679 = 400440480444 / (4 + 0 + 0 + 4 + 4 + 0 + 4 + 8 + 0 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 400440480399 and 400440480408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5561673304 + ... + 5561673375.

Almost surely, 2^400440480444 is an apocalyptic number.

It is an amenable number.

400440480444 is an abundant number, since it is smaller than the sum of its proper divisors (611784067436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400440480444 is a wasteful number, since it uses less digits than its factorization.

400440480444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123346689 (or 11123346684 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 36.

The spelling of 400440480444 in words is "four hundred billion, four hundred forty million, four hundred eighty thousand, four hundred forty-four".