Adding to 40020055 its reverse (55002004), we get a palindrome (95022059).
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
Almost surely, 240020055 is an apocalyptic number.
40020055 is an equidigital number, since it uses as much as digits as its factorization.
40020055 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8004016.
The square root of 40020055 is about 6326.1406086175. The cubic root of 40020055 is about 342.0523357318.
The spelling of 40020055 in words is "forty million, twenty thousand, fifty-five".