40205012040 has 128 divisors (see below), whose sum is σ = 137133532800. Its totient is φ = 10471991040.

The previous prime is 40205012033. The next prime is 40205012077. The reversal of 40205012040 is 4021050204.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 31 ways as a sum of consecutive naturals, for example, 386431 + ... + 479310.

It is an arithmetic number, because the mean of its divisors is an integer number (1071355725).

Almost surely, 2^40205012040 is an apocalyptic number.

40205012040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40205012040 is an abundant number, since it is smaller than the sum of its proper divisors (96928520760).

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

40205012040 is a wasteful number, since it uses less digits than its factorization.

40205012040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865804 (or 865794 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 40205012040 its reverse (4021050204), we get a palindrome (44226062244).

The spelling of 40205012040 in words is "forty billion, two hundred five million, twelve thousand, forty".