40040044020 has 72 divisors (see below), whose sum is σ = 121483514880. Its totient is φ = 10674820800.

The previous prime is 40040043997. The next prime is 40040044043. The reversal of 40040044020 is 2044004004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40040043997) and next prime (40040044043).

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

It is a junction number, because it is equal to n+sod(n) for n = 40040043984 and 40040044002.

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 23 ways as a sum of consecutive naturals, for example, 811045 + ... + 858995.

It is an arithmetic number, because the mean of its divisors is an integer number (1687271040).

Almost surely, 2^40040044020 is an apocalyptic number.

It is an amenable number.

40040044020 is an abundant number, since it is smaller than the sum of its proper divisors (81443470860).

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

40040044020 is a wasteful number, since it uses less digits than its factorization.

40040044020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52605 (or 52600 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 40040044020 its reverse (2044004004), we get a palindrome (42084048024).

The spelling of 40040044020 in words is "forty billion, forty million, forty-four thousand, twenty".