40020040044 has 36 divisors (see below), whose sum is σ = 101239882744. Its totient is φ = 13329712512.

The previous prime is 40020040037. The next prime is 40020040057. The reversal of 40020040044 is 44004002004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 40020039999 and 40020040026.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381862 + ... + 475245.

Almost surely, 2^40020040044 is an apocalyptic number.

It is an amenable number.

40020040044 is an abundant number, since it is smaller than the sum of its proper divisors (61219842700).

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

40020040044 is a wasteful number, since it uses less digits than its factorization.

40020040044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858414 (or 858409 counting only the distinct ones).

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

Adding to 40020040044 its reverse (44004002004), we get a palindrome (84024042048).

The spelling of 40020040044 in words is "forty billion, twenty million, forty thousand, forty-four".