40000008440 has 32 divisors (see below), whose sum is σ = 102857165280. Its totient is φ = 13714288512.

The previous prime is 40000008439. The next prime is 40000008463. The reversal of 40000008440 is 4480000004.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71428307 + ... + 71428866.

It is an arithmetic number, because the mean of its divisors is an integer number (3214286415).

Almost surely, 2^40000008440 is an apocalyptic number.

40000008440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40000008440 is an abundant number, since it is smaller than the sum of its proper divisors (62857156840).

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

40000008440 is a wasteful number, since it uses less digits than its factorization.

40000008440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142857191 (or 142857187 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 40000008440 its reverse (4480000004), we get a palindrome (44480008444).

The spelling of 40000008440 in words is "forty billion, eight thousand, four hundred forty".