40455821 has 16 divisors (see below), whose sum is σ = 47808000. Its totient is φ = 34214544.

The previous prime is 40455817. The next prime is 40455847. The reversal of 40455821 is 12855404.

40455821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40455821 - 2² = 40455817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40455881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26351 + ... + 27843.

It is an arithmetic number, because the mean of its divisors is an integer number (2988000).

Almost surely, 2^40455821 is an apocalyptic number.

It is an amenable number.

40455821 is a deficient number, since it is larger than the sum of its proper divisors (7352179).

40455821 is an equidigital number, since it uses as much as digits as its factorization.

40455821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593 (or 1579 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 40455821 is about 6360.4890535241. The cubic root of 40455821 is about 343.2893573822.

The spelling of 40455821 in words is "forty million, four hundred fifty-five thousand, eight hundred twenty-one".