40555812 has 144 divisors (see below), whose sum is σ = 115831296. Its totient is φ = 10982400.

The previous prime is 40555777. The next prime is 40555841. The reversal of 40555812 is 21855504.

It is a self number, because there is not a number n which added to its sum of digits gives 40555812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 765178 + ... + 765230.

It is an arithmetic number, because the mean of its divisors is an integer number (804384).

Almost surely, 2^40555812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40555812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57915648).

40555812 is an abundant number, since it is smaller than the sum of its proper divisors (75275484).

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

40555812 is a wasteful number, since it uses less digits than its factorization.

40555812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 40555812 is about 6368.3445258560. The cubic root of 40555812 is about 343.5719504596.

The spelling of 40555812 in words is "forty million, five hundred fifty-five thousand, eight hundred twelve".