40545421 has 4 divisors (see below), whose sum is σ = 46337632. Its totient is φ = 34753212.

The previous prime is 40545409. The next prime is 40545437. The reversal of 40545421 is 12454504.

It is a happy number.

40545421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40545421 - 2⁹ = 40544909 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 (40545121) 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 3 ways as a sum of consecutive naturals, for example, 2896095 + ... + 2896108.

It is an arithmetic number, because the mean of its divisors is an integer number (11584408).

Almost surely, 2^40545421 is an apocalyptic number.

It is an amenable number.

40545421 is a deficient number, since it is larger than the sum of its proper divisors (5792211).

40545421 is an equidigital number, since it uses as much as digits as its factorization.

40545421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5792210.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 40545421 is about 6367.5286414746. The cubic root of 40545421 is about 343.5426052117.

Adding to 40545421 its reverse (12454504), we get a palindrome (52999925).

The spelling of 40545421 in words is "forty million, five hundred forty-five thousand, four hundred twenty-one".