400040040440 has 16 divisors (see below), whose sum is σ = 900090091080. Its totient is φ = 160016016160.

The previous prime is 400040040401. The next prime is 400040040473. The reversal of 400040040440 is 44040040004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5000500466 + ... + 5000500545.

Almost surely, 2^400040040440 is an apocalyptic number.

400040040440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400040040440 is an abundant number, since it is smaller than the sum of its proper divisors (500050050640).

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

400040040440 is a wasteful number, since it uses less digits than its factorization.

400040040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10001001022 (or 10001001018 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 400040040440 its reverse (44040040004), we get a palindrome (444080080444).

The spelling of 400040040440 in words is "four hundred billion, forty million, forty thousand, four hundred forty".