400044840084 has 18 divisors (see below), whose sum is σ = 1011224456970. Its totient is φ = 133348280016.

The previous prime is 400044840049. The next prime is 400044840131. The reversal of 400044840084 is 480048440004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 386162816400 + 13882023684 = 621420^2 + 117822^2 .

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: 11112356669 = 400044840084 / (4 + 0 + 0 + 0 + 4 + 4 + 8 + 4 + 0 + 0 + 8 + 4).

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, 5556178299 + ... + 5556178370.

Almost surely, 2^400044840084 is an apocalyptic number.

It is an amenable number.

400044840084 is an abundant number, since it is smaller than the sum of its proper divisors (611179616886).

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

400044840084 is a wasteful number, since it uses less digits than its factorization.

400044840084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112356679 (or 11112356674 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 36.

The spelling of 400044840084 in words is "four hundred billion, forty-four million, eight hundred forty thousand, eighty-four".